Add m-esr52 at 52.6.0

38 files changed, 3956 insertions, 0 deletions

diff --git a/dom/performance/Performance.cpp b/dom/performance/Performance.cpp
new file mode 100644
index 000000000..17273c55d
--- /dev/null
+++ b/dom/performance/Performance.cpp
@@ -0,0 +1,536 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "Performance.h"
+
+#include "GeckoProfiler.h"
+#include "PerformanceEntry.h"
+#include "PerformanceMainThread.h"
+#include "PerformanceMark.h"
+#include "PerformanceMeasure.h"
+#include "PerformanceObserver.h"
+#include "PerformanceResourceTiming.h"
+#include "PerformanceWorker.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/dom/PerformanceBinding.h"
+#include "mozilla/dom/PerformanceEntryEvent.h"
+#include "mozilla/dom/PerformanceNavigationBinding.h"
+#include "mozilla/dom/PerformanceObserverBinding.h"
+#include "mozilla/IntegerPrintfMacros.h"
+#include "mozilla/Preferences.h"
+#include "WorkerPrivate.h"
+#include "WorkerRunnable.h"
+
+#ifdef MOZ_WIDGET_GONK
+#define PERFLOG(msg, ...)  __android_log_print(ANDROID_LOG_INFO, "PerformanceTiming", msg, ##__VA_ARGS__)
+#else
+#define PERFLOG(msg, ...) printf_stderr(msg, ##__VA_ARGS__)
+#endif
+
+namespace mozilla {
+namespace dom {
+
+using namespace workers;
+
+namespace {
+
+// Helper classes
+class MOZ_STACK_CLASS PerformanceEntryComparator final
+{
+public:
+  bool Equals(const PerformanceEntry* aElem1,
+              const PerformanceEntry* aElem2) const
+  {
+    MOZ_ASSERT(aElem1 && aElem2,
+               "Trying to compare null performance entries");
+    return aElem1->StartTime() == aElem2->StartTime();
+  }
+
+  bool LessThan(const PerformanceEntry* aElem1,
+                const PerformanceEntry* aElem2) const
+  {
+    MOZ_ASSERT(aElem1 && aElem2,
+               "Trying to compare null performance entries");
+    return aElem1->StartTime() < aElem2->StartTime();
+  }
+};
+
+class PrefEnabledRunnable final
+  : public WorkerCheckAPIExposureOnMainThreadRunnable
+{
+public:
+  PrefEnabledRunnable(WorkerPrivate* aWorkerPrivate,
+                      const nsCString& aPrefName)
+    : WorkerCheckAPIExposureOnMainThreadRunnable(aWorkerPrivate)
+    , mEnabled(false)
+    , mPrefName(aPrefName)
+  { }
+
+  bool MainThreadRun() override
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+    mEnabled = Preferences::GetBool(mPrefName.get(), false);
+    return true;
+  }
+
+  bool IsEnabled() const
+  {
+    return mEnabled;
+  }
+
+private:
+  bool mEnabled;
+  nsCString mPrefName;
+};
+
+} // anonymous namespace
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(Performance)
+NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(Performance,
+                                   DOMEventTargetHelper,
+                                   mUserEntries,
+                                   mResourceEntries);
+
+NS_IMPL_ADDREF_INHERITED(Performance, DOMEventTargetHelper)
+NS_IMPL_RELEASE_INHERITED(Performance, DOMEventTargetHelper)
+
+/* static */ already_AddRefed<Performance>
+Performance::CreateForMainThread(nsPIDOMWindowInner* aWindow,
+                                 nsDOMNavigationTiming* aDOMTiming,
+                                 nsITimedChannel* aChannel,
+                                 Performance* aParentPerformance)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<Performance> performance =
+    new PerformanceMainThread(aWindow, aDOMTiming, aChannel,
+                              aParentPerformance);
+  return performance.forget();
+}
+
+/* static */ already_AddRefed<Performance>
+Performance::CreateForWorker(workers::WorkerPrivate* aWorkerPrivate)
+{
+  MOZ_ASSERT(aWorkerPrivate);
+  aWorkerPrivate->AssertIsOnWorkerThread();
+
+  RefPtr<Performance> performance = new PerformanceWorker(aWorkerPrivate);
+  return performance.forget();
+}
+
+Performance::Performance()
+  : mResourceTimingBufferSize(kDefaultResourceTimingBufferSize)
+  , mPendingNotificationObserversTask(false)
+{
+  MOZ_ASSERT(!NS_IsMainThread());
+}
+
+Performance::Performance(nsPIDOMWindowInner* aWindow)
+  : DOMEventTargetHelper(aWindow)
+  , mResourceTimingBufferSize(kDefaultResourceTimingBufferSize)
+  , mPendingNotificationObserversTask(false)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+Performance::~Performance()
+{}
+
+JSObject*
+Performance::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return PerformanceBinding::Wrap(aCx, this, aGivenProto);
+}
+
+void
+Performance::GetEntries(nsTArray<RefPtr<PerformanceEntry>>& aRetval)
+{
+  aRetval = mResourceEntries;
+  aRetval.AppendElements(mUserEntries);
+  aRetval.Sort(PerformanceEntryComparator());
+}
+
+void
+Performance::GetEntriesByType(const nsAString& aEntryType,
+                              nsTArray<RefPtr<PerformanceEntry>>& aRetval)
+{
+  if (aEntryType.EqualsLiteral("resource")) {
+    aRetval = mResourceEntries;
+    return;
+  }
+
+  aRetval.Clear();
+
+  if (aEntryType.EqualsLiteral("mark") ||
+      aEntryType.EqualsLiteral("measure")) {
+    for (PerformanceEntry* entry : mUserEntries) {
+      if (entry->GetEntryType().Equals(aEntryType)) {
+        aRetval.AppendElement(entry);
+      }
+    }
+  }
+}
+
+void
+Performance::GetEntriesByName(const nsAString& aName,
+                              const Optional<nsAString>& aEntryType,
+                              nsTArray<RefPtr<PerformanceEntry>>& aRetval)
+{
+  aRetval.Clear();
+
+  for (PerformanceEntry* entry : mResourceEntries) {
+    if (entry->GetName().Equals(aName) &&
+        (!aEntryType.WasPassed() ||
+         entry->GetEntryType().Equals(aEntryType.Value()))) {
+      aRetval.AppendElement(entry);
+    }
+  }
+
+  for (PerformanceEntry* entry : mUserEntries) {
+    if (entry->GetName().Equals(aName) &&
+        (!aEntryType.WasPassed() ||
+         entry->GetEntryType().Equals(aEntryType.Value()))) {
+      aRetval.AppendElement(entry);
+    }
+  }
+
+  aRetval.Sort(PerformanceEntryComparator());
+}
+
+void
+Performance::ClearUserEntries(const Optional<nsAString>& aEntryName,
+                              const nsAString& aEntryType)
+{
+  for (uint32_t i = 0; i < mUserEntries.Length();) {
+    if ((!aEntryName.WasPassed() ||
+         mUserEntries[i]->GetName().Equals(aEntryName.Value())) &&
+        (aEntryType.IsEmpty() ||
+         mUserEntries[i]->GetEntryType().Equals(aEntryType))) {
+      mUserEntries.RemoveElementAt(i);
+    } else {
+      ++i;
+    }
+  }
+}
+
+void
+Performance::ClearResourceTimings()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  mResourceEntries.Clear();
+}
+
+DOMHighResTimeStamp
+Performance::RoundTime(double aTime) const
+{
+  // Round down to the nearest 20us, because if the timer is too accurate people
+  // can do nasty timing attacks with it.
+  const double maxResolutionMs = 0.020;
+  return floor(aTime / maxResolutionMs) * maxResolutionMs;
+}
+
+
+void
+Performance::Mark(const nsAString& aName, ErrorResult& aRv)
+{
+  // Don't add the entry if the buffer is full. XXX should be removed by bug 1159003.
+  if (mUserEntries.Length() >= mResourceTimingBufferSize) {
+    return;
+  }
+
+  if (IsPerformanceTimingAttribute(aName)) {
+    aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
+    return;
+  }
+
+  RefPtr<PerformanceMark> performanceMark =
+    new PerformanceMark(GetAsISupports(), aName, Now());
+  InsertUserEntry(performanceMark);
+
+  if (profiler_is_active()) {
+    PROFILER_MARKER(NS_ConvertUTF16toUTF8(aName).get());
+  }
+}
+
+void
+Performance::ClearMarks(const Optional<nsAString>& aName)
+{
+  ClearUserEntries(aName, NS_LITERAL_STRING("mark"));
+}
+
+DOMHighResTimeStamp
+Performance::ResolveTimestampFromName(const nsAString& aName,
+                                          ErrorResult& aRv)
+{
+  AutoTArray<RefPtr<PerformanceEntry>, 1> arr;
+  DOMHighResTimeStamp ts;
+  Optional<nsAString> typeParam;
+  nsAutoString str;
+  str.AssignLiteral("mark");
+  typeParam = &str;
+  GetEntriesByName(aName, typeParam, arr);
+  if (!arr.IsEmpty()) {
+    return arr.LastElement()->StartTime();
+  }
+
+  if (!IsPerformanceTimingAttribute(aName)) {
+    aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
+    return 0;
+  }
+
+  ts = GetPerformanceTimingFromString(aName);
+  if (!ts) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_ACCESS_ERR);
+    return 0;
+  }
+
+  return ts - CreationTime();
+}
+
+void
+Performance::Measure(const nsAString& aName,
+                     const Optional<nsAString>& aStartMark,
+                     const Optional<nsAString>& aEndMark,
+                     ErrorResult& aRv)
+{
+  // Don't add the entry if the buffer is full. XXX should be removed by bug
+  // 1159003.
+  if (mUserEntries.Length() >= mResourceTimingBufferSize) {
+    return;
+  }
+
+  DOMHighResTimeStamp startTime;
+  DOMHighResTimeStamp endTime;
+
+  if (IsPerformanceTimingAttribute(aName)) {
+    aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
+    return;
+  }
+
+  if (aStartMark.WasPassed()) {
+    startTime = ResolveTimestampFromName(aStartMark.Value(), aRv);
+    if (NS_WARN_IF(aRv.Failed())) {
+      return;
+    }
+  } else {
+    // Navigation start is used in this case, but since DOMHighResTimeStamp is
+    // in relation to navigation start, this will be zero if a name is not
+    // passed.
+    startTime = 0;
+  }
+
+  if (aEndMark.WasPassed()) {
+    endTime = ResolveTimestampFromName(aEndMark.Value(), aRv);
+    if (NS_WARN_IF(aRv.Failed())) {
+      return;
+    }
+  } else {
+    endTime = Now();
+  }
+
+  RefPtr<PerformanceMeasure> performanceMeasure =
+    new PerformanceMeasure(GetAsISupports(), aName, startTime, endTime);
+  InsertUserEntry(performanceMeasure);
+}
+
+void
+Performance::ClearMeasures(const Optional<nsAString>& aName)
+{
+  ClearUserEntries(aName, NS_LITERAL_STRING("measure"));
+}
+
+void
+Performance::LogEntry(PerformanceEntry* aEntry, const nsACString& aOwner) const
+{
+  PERFLOG("Performance Entry: %s|%s|%s|%f|%f|%" PRIu64 "\n",
+          aOwner.BeginReading(),
+          NS_ConvertUTF16toUTF8(aEntry->GetEntryType()).get(),
+          NS_ConvertUTF16toUTF8(aEntry->GetName()).get(),
+          aEntry->StartTime(),
+          aEntry->Duration(),
+          static_cast<uint64_t>(PR_Now() / PR_USEC_PER_MSEC));
+}
+
+void
+Performance::TimingNotification(PerformanceEntry* aEntry,
+                                const nsACString& aOwner, uint64_t aEpoch)
+{
+  PerformanceEntryEventInit init;
+  init.mBubbles = false;
+  init.mCancelable = false;
+  init.mName = aEntry->GetName();
+  init.mEntryType = aEntry->GetEntryType();
+  init.mStartTime = aEntry->StartTime();
+  init.mDuration = aEntry->Duration();
+  init.mEpoch = aEpoch;
+  init.mOrigin = NS_ConvertUTF8toUTF16(aOwner.BeginReading());
+
+  RefPtr<PerformanceEntryEvent> perfEntryEvent =
+    PerformanceEntryEvent::Constructor(this, NS_LITERAL_STRING("performanceentry"), init);
+
+  nsCOMPtr<EventTarget> et = do_QueryInterface(GetOwner());
+  if (et) {
+    bool dummy = false;
+    et->DispatchEvent(perfEntryEvent, &dummy);
+  }
+}
+
+void
+Performance::InsertUserEntry(PerformanceEntry* aEntry)
+{
+  mUserEntries.InsertElementSorted(aEntry,
+                                   PerformanceEntryComparator());
+
+  QueueEntry(aEntry);
+}
+
+void
+Performance::SetResourceTimingBufferSize(uint64_t aMaxSize)
+{
+  mResourceTimingBufferSize = aMaxSize;
+}
+
+void
+Performance::InsertResourceEntry(PerformanceEntry* aEntry)
+{
+  MOZ_ASSERT(aEntry);
+  MOZ_ASSERT(mResourceEntries.Length() < mResourceTimingBufferSize);
+  if (mResourceEntries.Length() >= mResourceTimingBufferSize) {
+    return;
+  }
+
+  mResourceEntries.InsertElementSorted(aEntry,
+                                       PerformanceEntryComparator());
+  if (mResourceEntries.Length() == mResourceTimingBufferSize) {
+    // call onresourcetimingbufferfull
+    DispatchBufferFullEvent();
+  }
+  QueueEntry(aEntry);
+}
+
+void
+Performance::AddObserver(PerformanceObserver* aObserver)
+{
+  mObservers.AppendElementUnlessExists(aObserver);
+}
+
+void
+Performance::RemoveObserver(PerformanceObserver* aObserver)
+{
+  mObservers.RemoveElement(aObserver);
+}
+
+void
+Performance::NotifyObservers()
+{
+  mPendingNotificationObserversTask = false;
+  NS_OBSERVER_ARRAY_NOTIFY_XPCOM_OBSERVERS(mObservers,
+                                           PerformanceObserver,
+                                           Notify, ());
+}
+
+void
+Performance::CancelNotificationObservers()
+{
+  mPendingNotificationObserversTask = false;
+}
+
+class NotifyObserversTask final : public CancelableRunnable
+{
+public:
+  explicit NotifyObserversTask(Performance* aPerformance)
+    : mPerformance(aPerformance)
+  {
+    MOZ_ASSERT(mPerformance);
+  }
+
+  NS_IMETHOD Run() override
+  {
+    MOZ_ASSERT(mPerformance);
+    mPerformance->NotifyObservers();
+    return NS_OK;
+  }
+
+  nsresult Cancel() override
+  {
+    mPerformance->CancelNotificationObservers();
+    mPerformance = nullptr;
+    return NS_OK;
+  }
+
+private:
+  ~NotifyObserversTask()
+  {
+  }
+
+  RefPtr<Performance> mPerformance;
+};
+
+void
+Performance::RunNotificationObserversTask()
+{
+  mPendingNotificationObserversTask = true;
+  nsCOMPtr<nsIRunnable> task = new NotifyObserversTask(this);
+  nsresult rv = NS_DispatchToCurrentThread(task);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    mPendingNotificationObserversTask = false;
+  }
+}
+
+void
+Performance::QueueEntry(PerformanceEntry* aEntry)
+{
+  if (mObservers.IsEmpty()) {
+    return;
+  }
+  NS_OBSERVER_ARRAY_NOTIFY_XPCOM_OBSERVERS(mObservers,
+                                           PerformanceObserver,
+                                           QueueEntry, (aEntry));
+
+  if (!mPendingNotificationObserversTask) {
+    RunNotificationObserversTask();
+  }
+}
+
+/* static */ bool
+Performance::IsEnabled(JSContext* aCx, JSObject* aGlobal)
+{
+  if (NS_IsMainThread()) {
+    return Preferences::GetBool("dom.enable_user_timing", false);
+  }
+
+  WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+  MOZ_ASSERT(workerPrivate);
+  workerPrivate->AssertIsOnWorkerThread();
+
+  RefPtr<PrefEnabledRunnable> runnable =
+    new PrefEnabledRunnable(workerPrivate,
+                            NS_LITERAL_CSTRING("dom.enable_user_timing"));
+  return runnable->Dispatch() && runnable->IsEnabled();
+}
+
+/* static */ bool
+Performance::IsObserverEnabled(JSContext* aCx, JSObject* aGlobal)
+{
+  if (NS_IsMainThread()) {
+    return Preferences::GetBool("dom.enable_performance_observer", false);
+  }
+
+  WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+  MOZ_ASSERT(workerPrivate);
+  workerPrivate->AssertIsOnWorkerThread();
+
+  RefPtr<PrefEnabledRunnable> runnable =
+    new PrefEnabledRunnable(workerPrivate,
+                            NS_LITERAL_CSTRING("dom.enable_performance_observer"));
+
+  return runnable->Dispatch() && runnable->IsEnabled();
+}
+
+} // dom namespace
+} // mozilla namespace
diff --git a/dom/performance/Performance.h b/dom/performance/Performance.h
new file mode 100644
index 000000000..bc70589a5
--- /dev/null
+++ b/dom/performance/Performance.h
@@ -0,0 +1,162 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_Performance_h
+#define mozilla_dom_Performance_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/DOMEventTargetHelper.h"
+#include "nsCOMPtr.h"
+#include "nsDOMNavigationTiming.h"
+
+class nsITimedChannel;
+class nsIHttpChannel;
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace dom {
+
+class PerformanceEntry;
+class PerformanceNavigation;
+class PerformanceObserver;
+class PerformanceTiming;
+
+namespace workers {
+class WorkerPrivate;
+}
+
+// Base class for main-thread and worker Performance API
+class Performance : public DOMEventTargetHelper
+{
+public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(Performance,
+                                           DOMEventTargetHelper)
+
+  static bool IsEnabled(JSContext* aCx, JSObject* aGlobal);
+
+  static bool IsObserverEnabled(JSContext* aCx, JSObject* aGlobal);
+
+  static already_AddRefed<Performance>
+  CreateForMainThread(nsPIDOMWindowInner* aWindow,
+                      nsDOMNavigationTiming* aDOMTiming,
+                      nsITimedChannel* aChannel,
+                      Performance* aParentPerformance);
+
+  static already_AddRefed<Performance>
+  CreateForWorker(workers::WorkerPrivate* aWorkerPrivate);
+
+  JSObject* WrapObject(JSContext *cx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  void GetEntries(nsTArray<RefPtr<PerformanceEntry>>& aRetval);
+
+  void GetEntriesByType(const nsAString& aEntryType,
+                        nsTArray<RefPtr<PerformanceEntry>>& aRetval);
+
+  void GetEntriesByName(const nsAString& aName,
+                        const Optional<nsAString>& aEntryType,
+                        nsTArray<RefPtr<PerformanceEntry>>& aRetval);
+
+  virtual void AddEntry(nsIHttpChannel* channel,
+                        nsITimedChannel* timedChannel) = 0;
+
+  void ClearResourceTimings();
+
+  virtual DOMHighResTimeStamp Now() const = 0;
+
+  void Mark(const nsAString& aName, ErrorResult& aRv);
+
+  void ClearMarks(const Optional<nsAString>& aName);
+
+  void Measure(const nsAString& aName,
+               const Optional<nsAString>& aStartMark,
+               const Optional<nsAString>& aEndMark,
+               ErrorResult& aRv);
+
+  void ClearMeasures(const Optional<nsAString>& aName);
+
+  void SetResourceTimingBufferSize(uint64_t aMaxSize);
+
+  void AddObserver(PerformanceObserver* aObserver);
+  void RemoveObserver(PerformanceObserver* aObserver);
+  void NotifyObservers();
+  void CancelNotificationObservers();
+
+  virtual PerformanceTiming* Timing() = 0;
+
+  virtual PerformanceNavigation* Navigation() = 0;
+
+  IMPL_EVENT_HANDLER(resourcetimingbufferfull)
+
+  virtual void GetMozMemory(JSContext *aCx,
+                            JS::MutableHandle<JSObject*> aObj) = 0;
+
+  virtual nsDOMNavigationTiming* GetDOMTiming() const = 0;
+
+  virtual nsITimedChannel* GetChannel() const = 0;
+
+  virtual Performance* GetParentPerformance() const = 0;
+
+protected:
+  Performance();
+  explicit Performance(nsPIDOMWindowInner* aWindow);
+
+  virtual ~Performance();
+
+  virtual void InsertUserEntry(PerformanceEntry* aEntry);
+  void InsertResourceEntry(PerformanceEntry* aEntry);
+
+  void ClearUserEntries(const Optional<nsAString>& aEntryName,
+                        const nsAString& aEntryType);
+
+  DOMHighResTimeStamp ResolveTimestampFromName(const nsAString& aName,
+                                               ErrorResult& aRv);
+
+  virtual nsISupports* GetAsISupports() = 0;
+
+  virtual void DispatchBufferFullEvent() = 0;
+
+  virtual TimeStamp CreationTimeStamp() const = 0;
+
+  virtual DOMHighResTimeStamp CreationTime() const = 0;
+
+  virtual bool IsPerformanceTimingAttribute(const nsAString& aName) = 0;
+
+  virtual DOMHighResTimeStamp
+  GetPerformanceTimingFromString(const nsAString& aTimingName) = 0;
+
+  bool IsResourceEntryLimitReached() const
+  {
+    return mResourceEntries.Length() >= mResourceTimingBufferSize;
+  }
+
+  void LogEntry(PerformanceEntry* aEntry, const nsACString& aOwner) const;
+  void TimingNotification(PerformanceEntry* aEntry, const nsACString& aOwner,
+                          uint64_t epoch);
+
+  void RunNotificationObserversTask();
+  void QueueEntry(PerformanceEntry* aEntry);
+
+  DOMHighResTimeStamp RoundTime(double aTime) const;
+
+  nsTObserverArray<PerformanceObserver*> mObservers;
+
+private:
+  nsTArray<RefPtr<PerformanceEntry>> mUserEntries;
+  nsTArray<RefPtr<PerformanceEntry>> mResourceEntries;
+
+  uint64_t mResourceTimingBufferSize;
+  static const uint64_t kDefaultResourceTimingBufferSize = 150;
+  bool mPendingNotificationObserversTask;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_Performance_h
diff --git a/dom/performance/PerformanceEntry.cpp b/dom/performance/PerformanceEntry.cpp
new file mode 100644
index 000000000..8a4bc4c71
--- /dev/null
+++ b/dom/performance/PerformanceEntry.cpp
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PerformanceEntry.h"
+#include "MainThreadUtils.h"
+#include "mozilla/dom/PerformanceEntryBinding.h"
+#include "nsIURI.h"
+
+using namespace mozilla::dom;
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(PerformanceEntry, mParent)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(PerformanceEntry)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(PerformanceEntry)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PerformanceEntry)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+PerformanceEntry::PerformanceEntry(nsISupports* aParent,
+                                   const nsAString& aName,
+                                   const nsAString& aEntryType)
+: mParent(aParent),
+  mName(aName),
+  mEntryType(aEntryType)
+{
+  // mParent is null in workers.
+  MOZ_ASSERT(mParent || !NS_IsMainThread());
+}
+
+PerformanceEntry::~PerformanceEntry()
+{
+}
+
+JSObject*
+PerformanceEntry::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return mozilla::dom::PerformanceEntryBinding::Wrap(aCx, this, aGivenProto);
+}
diff --git a/dom/performance/PerformanceEntry.h b/dom/performance/PerformanceEntry.h
new file mode 100644
index 000000000..bc4f84f1c
--- /dev/null
+++ b/dom/performance/PerformanceEntry.h
@@ -0,0 +1,96 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_PerformanceEntry_h___
+#define mozilla_dom_PerformanceEntry_h___
+
+#include "nsDOMNavigationTiming.h"
+#include "nsString.h"
+#include "nsWrapperCache.h"
+
+class nsISupports;
+
+namespace mozilla {
+namespace dom {
+class PerformanceResourceTiming;
+
+// http://www.w3.org/TR/performance-timeline/#performanceentry
+class PerformanceEntry : public nsISupports,
+                         public nsWrapperCache
+{
+protected:
+  virtual ~PerformanceEntry();
+
+public:
+  PerformanceEntry(nsISupports* aParent,
+                   const nsAString& aName,
+                   const nsAString& aEntryType);
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(PerformanceEntry)
+
+  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+
+  nsISupports* GetParentObject() const
+  {
+    return mParent;
+  }
+
+  void GetName(nsAString& aName) const
+  {
+    aName = mName;
+  }
+
+  const nsAString& GetName() const
+  {
+    return mName;
+  }
+
+  void SetName(const nsAString& aName)
+  {
+    mName = aName;
+  }
+
+  void GetEntryType(nsAString& aEntryType) const
+  {
+    aEntryType = mEntryType;
+  }
+
+  const nsAString& GetEntryType()
+  {
+    return mEntryType;
+  }
+
+  void SetEntryType(const nsAString& aEntryType)
+  {
+    mEntryType = aEntryType;
+  }
+
+  virtual DOMHighResTimeStamp StartTime() const
+  {
+    return 0;
+  }
+
+  virtual DOMHighResTimeStamp Duration() const
+  {
+    return 0;
+  }
+
+  virtual const PerformanceResourceTiming* ToResourceTiming() const
+  {
+    return nullptr;
+  }
+
+protected:
+  nsCOMPtr<nsISupports> mParent;
+  nsString mName;
+  nsString mEntryType;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif /* mozilla_dom_PerformanceEntry_h___ */
diff --git a/dom/performance/PerformanceMainThread.cpp b/dom/performance/PerformanceMainThread.cpp
new file mode 100644
index 000000000..b60b68f62
--- /dev/null
+++ b/dom/performance/PerformanceMainThread.cpp
@@ -0,0 +1,336 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PerformanceMainThread.h"
+#include "PerformanceNavigation.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(PerformanceMainThread)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(PerformanceMainThread,
+                                                Performance)
+NS_IMPL_CYCLE_COLLECTION_UNLINK(mTiming,
+                                mNavigation,
+                                mParentPerformance)
+  tmp->mMozMemory = nullptr;
+  mozilla::DropJSObjects(this);
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(PerformanceMainThread,
+                                                  Performance)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mTiming,
+                                    mNavigation,
+                                    mParentPerformance)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(PerformanceMainThread,
+                                                Performance)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mMozMemory)
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+NS_IMPL_ADDREF_INHERITED(PerformanceMainThread, Performance)
+NS_IMPL_RELEASE_INHERITED(PerformanceMainThread, Performance)
+
+// QueryInterface implementation for PerformanceMainThread
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PerformanceMainThread)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END_INHERITING(Performance)
+
+PerformanceMainThread::PerformanceMainThread(nsPIDOMWindowInner* aWindow,
+                                             nsDOMNavigationTiming* aDOMTiming,
+                                             nsITimedChannel* aChannel,
+                                             Performance* aParentPerformance)
+  : Performance(aWindow)
+  , mDOMTiming(aDOMTiming)
+  , mChannel(aChannel)
+  , mParentPerformance(aParentPerformance)
+{
+  MOZ_ASSERT(aWindow, "Parent window object should be provided");
+}
+
+PerformanceMainThread::~PerformanceMainThread()
+{
+  mozilla::DropJSObjects(this);
+}
+
+void
+PerformanceMainThread::GetMozMemory(JSContext *aCx,
+                                    JS::MutableHandle<JSObject*> aObj)
+{
+  if (!mMozMemory) {
+    mMozMemory = js::gc::NewMemoryInfoObject(aCx);
+    if (mMozMemory) {
+      mozilla::HoldJSObjects(this);
+    }
+  }
+
+  aObj.set(mMozMemory);
+}
+
+PerformanceTiming*
+PerformanceMainThread::Timing()
+{
+  if (!mTiming) {
+    // For navigation timing, the third argument (an nsIHtttpChannel) is null
+    // since the cross-domain redirect were already checked.  The last argument
+    // (zero time) for performance.timing is the navigation start value.
+    mTiming = new PerformanceTiming(this, mChannel, nullptr,
+                                    mDOMTiming->GetNavigationStart());
+  }
+
+  return mTiming;
+}
+
+void
+PerformanceMainThread::DispatchBufferFullEvent()
+{
+  RefPtr<Event> event = NS_NewDOMEvent(this, nullptr, nullptr);
+  // it bubbles, and it isn't cancelable
+  event->InitEvent(NS_LITERAL_STRING("resourcetimingbufferfull"), true, false);
+  event->SetTrusted(true);
+  DispatchDOMEvent(nullptr, event, nullptr, nullptr);
+}
+
+PerformanceNavigation*
+PerformanceMainThread::Navigation()
+{
+  if (!mNavigation) {
+    mNavigation = new PerformanceNavigation(this);
+  }
+
+  return mNavigation;
+}
+
+DOMHighResTimeStamp
+PerformanceMainThread::Now() const
+{
+  return RoundTime(GetDOMTiming()->TimeStampToDOMHighRes(TimeStamp::Now()));
+}
+
+/**
+ * An entry should be added only after the resource is loaded.
+ * This method is not thread safe and can only be called on the main thread.
+ */
+void
+PerformanceMainThread::AddEntry(nsIHttpChannel* channel,
+                                nsITimedChannel* timedChannel)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // Check if resource timing is prefed off.
+  if (!nsContentUtils::IsResourceTimingEnabled()) {
+    return;
+  }
+
+  // Don't add the entry if the buffer is full
+  if (IsResourceEntryLimitReached()) {
+    return;
+  }
+
+  if (channel && timedChannel) {
+    nsAutoCString name;
+    nsAutoString initiatorType;
+    nsCOMPtr<nsIURI> originalURI;
+
+    timedChannel->GetInitiatorType(initiatorType);
+
+    // According to the spec, "The name attribute must return the resolved URL
+    // of the requested resource. This attribute must not change even if the
+    // fetch redirected to a different URL."
+    channel->GetOriginalURI(getter_AddRefs(originalURI));
+    originalURI->GetSpec(name);
+    NS_ConvertUTF8toUTF16 entryName(name);
+
+    // The nsITimedChannel argument will be used to gather all the timings.
+    // The nsIHttpChannel argument will be used to check if any cross-origin
+    // redirects occurred.
+    // The last argument is the "zero time" (offset). Since we don't want
+    // any offset for the resource timing, this will be set to "0" - the
+    // resource timing returns a relative timing (no offset).
+    RefPtr<PerformanceTiming> performanceTiming =
+        new PerformanceTiming(this, timedChannel, channel,
+            0);
+
+    // The PerformanceResourceTiming object will use the PerformanceTiming
+    // object to get all the required timings.
+    RefPtr<PerformanceResourceTiming> performanceEntry =
+      new PerformanceResourceTiming(performanceTiming, this, entryName);
+
+    nsAutoCString protocol;
+    channel->GetProtocolVersion(protocol);
+    performanceEntry->SetNextHopProtocol(NS_ConvertUTF8toUTF16(protocol));
+
+    uint64_t encodedBodySize = 0;
+    channel->GetEncodedBodySize(&encodedBodySize);
+    performanceEntry->SetEncodedBodySize(encodedBodySize);
+
+    uint64_t transferSize = 0;
+    channel->GetTransferSize(&transferSize);
+    performanceEntry->SetTransferSize(transferSize);
+
+    uint64_t decodedBodySize = 0;
+    channel->GetDecodedBodySize(&decodedBodySize);
+    if (decodedBodySize == 0) {
+      decodedBodySize = encodedBodySize;
+    }
+    performanceEntry->SetDecodedBodySize(decodedBodySize);
+
+    // If the initiator type had no valid value, then set it to the default
+    // ("other") value.
+    if (initiatorType.IsEmpty()) {
+      initiatorType = NS_LITERAL_STRING("other");
+    }
+    performanceEntry->SetInitiatorType(initiatorType);
+    InsertResourceEntry(performanceEntry);
+  }
+}
+
+// To be removed once bug 1124165 lands
+bool
+PerformanceMainThread::IsPerformanceTimingAttribute(const nsAString& aName)
+{
+  // Note that toJSON is added to this list due to bug 1047848
+  static const char* attributes[] =
+    {"navigationStart", "unloadEventStart", "unloadEventEnd", "redirectStart",
+     "redirectEnd", "fetchStart", "domainLookupStart", "domainLookupEnd",
+     "connectStart", "connectEnd", "requestStart", "responseStart",
+     "responseEnd", "domLoading", "domInteractive",
+     "domContentLoadedEventStart", "domContentLoadedEventEnd", "domComplete",
+     "loadEventStart", "loadEventEnd", nullptr};
+
+  for (uint32_t i = 0; attributes[i]; ++i) {
+    if (aName.EqualsASCII(attributes[i])) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+DOMHighResTimeStamp
+PerformanceMainThread::GetPerformanceTimingFromString(const nsAString& aProperty)
+{
+  if (!IsPerformanceTimingAttribute(aProperty)) {
+    return 0;
+  }
+  if (aProperty.EqualsLiteral("navigationStart")) {
+    // DOMHighResTimeStamp is in relation to navigationStart, so this will be
+    // zero.
+    return GetDOMTiming()->GetNavigationStart();
+  }
+  if (aProperty.EqualsLiteral("unloadEventStart")) {
+    return GetDOMTiming()->GetUnloadEventStart();
+  }
+  if (aProperty.EqualsLiteral("unloadEventEnd")) {
+    return GetDOMTiming()->GetUnloadEventEnd();
+  }
+  if (aProperty.EqualsLiteral("redirectStart")) {
+    return Timing()->RedirectStart();
+  }
+  if (aProperty.EqualsLiteral("redirectEnd")) {
+    return Timing()->RedirectEnd();
+  }
+  if (aProperty.EqualsLiteral("fetchStart")) {
+    return Timing()->FetchStart();
+  }
+  if (aProperty.EqualsLiteral("domainLookupStart")) {
+    return Timing()->DomainLookupStart();
+  }
+  if (aProperty.EqualsLiteral("domainLookupEnd")) {
+    return Timing()->DomainLookupEnd();
+  }
+  if (aProperty.EqualsLiteral("connectStart")) {
+    return Timing()->ConnectStart();
+  }
+  if (aProperty.EqualsLiteral("connectEnd")) {
+    return Timing()->ConnectEnd();
+  }
+  if (aProperty.EqualsLiteral("requestStart")) {
+    return Timing()->RequestStart();
+  }
+  if (aProperty.EqualsLiteral("responseStart")) {
+    return Timing()->ResponseStart();
+  }
+  if (aProperty.EqualsLiteral("responseEnd")) {
+    return Timing()->ResponseEnd();
+  }
+  if (aProperty.EqualsLiteral("domLoading")) {
+    return GetDOMTiming()->GetDomLoading();
+  }
+  if (aProperty.EqualsLiteral("domInteractive")) {
+    return GetDOMTiming()->GetDomInteractive();
+  }
+  if (aProperty.EqualsLiteral("domContentLoadedEventStart")) {
+    return GetDOMTiming()->GetDomContentLoadedEventStart();
+  }
+  if (aProperty.EqualsLiteral("domContentLoadedEventEnd")) {
+    return GetDOMTiming()->GetDomContentLoadedEventEnd();
+  }
+  if (aProperty.EqualsLiteral("domComplete")) {
+    return GetDOMTiming()->GetDomComplete();
+  }
+  if (aProperty.EqualsLiteral("loadEventStart")) {
+    return GetDOMTiming()->GetLoadEventStart();
+  }
+  if (aProperty.EqualsLiteral("loadEventEnd"))  {
+    return GetDOMTiming()->GetLoadEventEnd();
+  }
+  MOZ_CRASH("IsPerformanceTimingAttribute and GetPerformanceTimingFromString are out of sync");
+  return 0;
+}
+
+void
+PerformanceMainThread::InsertUserEntry(PerformanceEntry* aEntry)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsAutoCString uri;
+  uint64_t markCreationEpoch = 0;
+
+  if (nsContentUtils::IsUserTimingLoggingEnabled() ||
+      nsContentUtils::SendPerformanceTimingNotifications()) {
+    nsresult rv = NS_ERROR_FAILURE;
+    nsCOMPtr<nsPIDOMWindowInner> owner = GetOwner();
+    if (owner && owner->GetDocumentURI()) {
+      rv = owner->GetDocumentURI()->GetHost(uri);
+    }
+
+    if(NS_FAILED(rv)) {
+      // If we have no URI, just put in "none".
+      uri.AssignLiteral("none");
+    }
+    markCreationEpoch = static_cast<uint64_t>(PR_Now() / PR_USEC_PER_MSEC);
+
+    if (nsContentUtils::IsUserTimingLoggingEnabled()) {
+      Performance::LogEntry(aEntry, uri);
+    }
+  }
+
+  if (nsContentUtils::SendPerformanceTimingNotifications()) {
+    TimingNotification(aEntry, uri, markCreationEpoch);
+  }
+
+  Performance::InsertUserEntry(aEntry);
+}
+
+TimeStamp
+PerformanceMainThread::CreationTimeStamp() const
+{
+  return GetDOMTiming()->GetNavigationStartTimeStamp();
+}
+
+DOMHighResTimeStamp
+PerformanceMainThread::CreationTime() const
+{
+  return GetDOMTiming()->GetNavigationStart();
+}
+
+} // dom namespace
+} // mozilla namespace
diff --git a/dom/performance/PerformanceMainThread.h b/dom/performance/PerformanceMainThread.h
new file mode 100644
index 000000000..84773f29b
--- /dev/null
+++ b/dom/performance/PerformanceMainThread.h
@@ -0,0 +1,87 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_PerformanceMainThread_h
+#define mozilla_dom_PerformanceMainThread_h
+
+#include "Performance.h"
+
+namespace mozilla {
+namespace dom {
+
+class PerformanceMainThread final : public Performance
+{
+public:
+  PerformanceMainThread(nsPIDOMWindowInner* aWindow,
+                        nsDOMNavigationTiming* aDOMTiming,
+                        nsITimedChannel* aChannel,
+                        Performance* aParentPerformance);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(PerformanceMainThread,
+                                                         Performance)
+
+  // Performance WebIDL methods
+  DOMHighResTimeStamp Now() const override;
+
+  virtual PerformanceTiming* Timing() override;
+
+  virtual PerformanceNavigation* Navigation() override;
+
+  virtual void AddEntry(nsIHttpChannel* channel,
+                        nsITimedChannel* timedChannel) override;
+
+  TimeStamp CreationTimeStamp() const override;
+
+  DOMHighResTimeStamp CreationTime() const override;
+
+  virtual void GetMozMemory(JSContext *aCx,
+                            JS::MutableHandle<JSObject*> aObj) override;
+
+  virtual nsDOMNavigationTiming* GetDOMTiming() const override
+  {
+    return mDOMTiming;
+  }
+
+  virtual nsITimedChannel* GetChannel() const override
+  {
+    return mChannel;
+  }
+
+  virtual Performance* GetParentPerformance() const override
+  {
+    return mParentPerformance;
+  }
+
+protected:
+  ~PerformanceMainThread();
+
+  nsISupports* GetAsISupports() override
+  {
+    return this;
+  }
+
+  void InsertUserEntry(PerformanceEntry* aEntry) override;
+
+  bool IsPerformanceTimingAttribute(const nsAString& aName) override;
+
+  DOMHighResTimeStamp
+  GetPerformanceTimingFromString(const nsAString& aTimingName) override;
+
+  void DispatchBufferFullEvent() override;
+
+  RefPtr<nsDOMNavigationTiming> mDOMTiming;
+  nsCOMPtr<nsITimedChannel> mChannel;
+  RefPtr<PerformanceTiming> mTiming;
+  RefPtr<PerformanceNavigation> mNavigation;
+  RefPtr<Performance> mParentPerformance;
+  JS::Heap<JSObject*> mMozMemory;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_PerformanceMainThread_h
diff --git a/dom/performance/PerformanceMark.cpp b/dom/performance/PerformanceMark.cpp
new file mode 100644
index 000000000..30abde65d
--- /dev/null
+++ b/dom/performance/PerformanceMark.cpp
@@ -0,0 +1,31 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PerformanceMark.h"
+#include "MainThreadUtils.h"
+#include "mozilla/dom/PerformanceMarkBinding.h"
+
+using namespace mozilla::dom;
+
+PerformanceMark::PerformanceMark(nsISupports* aParent,
+                                 const nsAString& aName,
+                                 DOMHighResTimeStamp aStartTime)
+  : PerformanceEntry(aParent, aName, NS_LITERAL_STRING("mark"))
+  , mStartTime(aStartTime)
+{
+  // mParent is null in workers.
+  MOZ_ASSERT(mParent || !NS_IsMainThread());
+}
+
+PerformanceMark::~PerformanceMark()
+{
+}
+
+JSObject*
+PerformanceMark::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return PerformanceMarkBinding::Wrap(aCx, this, aGivenProto);
+}
diff --git a/dom/performance/PerformanceMark.h b/dom/performance/PerformanceMark.h
new file mode 100644
index 000000000..52ad49805
--- /dev/null
+++ b/dom/performance/PerformanceMark.h
@@ -0,0 +1,38 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_performancemark_h___
+#define mozilla_dom_performancemark_h___
+
+#include "mozilla/dom/PerformanceEntry.h"
+
+namespace mozilla {
+namespace dom {
+
+// http://www.w3.org/TR/user-timing/#performancemark
+class PerformanceMark final : public PerformanceEntry
+{
+public:
+  PerformanceMark(nsISupports* aParent,
+                  const nsAString& aName,
+                  DOMHighResTimeStamp aStartTime);
+
+  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+
+  virtual DOMHighResTimeStamp StartTime() const override
+  {
+    return mStartTime;
+  }
+
+protected:
+  virtual ~PerformanceMark();
+  DOMHighResTimeStamp mStartTime;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif /* mozilla_dom_performancemark_h___ */
diff --git a/dom/performance/PerformanceMeasure.cpp b/dom/performance/PerformanceMeasure.cpp
new file mode 100644
index 000000000..d91589fda
--- /dev/null
+++ b/dom/performance/PerformanceMeasure.cpp
@@ -0,0 +1,33 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PerformanceMeasure.h"
+#include "MainThreadUtils.h"
+#include "mozilla/dom/PerformanceMeasureBinding.h"
+
+using namespace mozilla::dom;
+
+PerformanceMeasure::PerformanceMeasure(nsISupports* aParent,
+                                       const nsAString& aName,
+                                       DOMHighResTimeStamp aStartTime,
+                                       DOMHighResTimeStamp aEndTime)
+: PerformanceEntry(aParent, aName, NS_LITERAL_STRING("measure")),
+  mStartTime(aStartTime),
+  mDuration(aEndTime - aStartTime)
+{
+  // mParent is null in workers.
+  MOZ_ASSERT(mParent || !NS_IsMainThread());
+}
+
+PerformanceMeasure::~PerformanceMeasure()
+{
+}
+
+JSObject*
+PerformanceMeasure::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return PerformanceMeasureBinding::Wrap(aCx, this, aGivenProto);
+}
diff --git a/dom/performance/PerformanceMeasure.h b/dom/performance/PerformanceMeasure.h
new file mode 100644
index 000000000..241ec0d5b
--- /dev/null
+++ b/dom/performance/PerformanceMeasure.h
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_performancemeasure_h___
+#define mozilla_dom_performancemeasure_h___
+
+#include "mozilla/dom/PerformanceEntry.h"
+
+namespace mozilla {
+namespace dom {
+
+// http://www.w3.org/TR/user-timing/#performancemeasure
+class PerformanceMeasure final : public PerformanceEntry
+{
+public:
+  PerformanceMeasure(nsISupports* aParent,
+                     const nsAString& aName,
+                     DOMHighResTimeStamp aStartTime,
+                     DOMHighResTimeStamp aEndTime);
+
+  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+
+  virtual DOMHighResTimeStamp StartTime() const override
+  {
+    return mStartTime;
+  }
+
+  virtual DOMHighResTimeStamp Duration() const override
+  {
+    return mDuration;
+  }
+
+protected:
+  virtual ~PerformanceMeasure();
+  DOMHighResTimeStamp mStartTime;
+  DOMHighResTimeStamp mDuration;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif /* mozilla_dom_performancemeasure_h___ */
diff --git a/dom/performance/PerformanceNavigation.cpp b/dom/performance/PerformanceNavigation.cpp
new file mode 100644
index 000000000..474e6c261
--- /dev/null
+++ b/dom/performance/PerformanceNavigation.cpp
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PerformanceNavigation.h"
+#include "PerformanceTiming.h"
+#include "mozilla/dom/PerformanceNavigationBinding.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(PerformanceNavigation, mPerformance)
+
+NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(PerformanceNavigation, AddRef)
+NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(PerformanceNavigation, Release)
+
+PerformanceNavigation::PerformanceNavigation(Performance* aPerformance)
+  : mPerformance(aPerformance)
+{
+  MOZ_ASSERT(aPerformance, "Parent performance object should be provided");
+}
+
+PerformanceNavigation::~PerformanceNavigation()
+{
+}
+
+JSObject*
+PerformanceNavigation::WrapObject(JSContext *cx,
+                                  JS::Handle<JSObject*> aGivenProto)
+{
+  return PerformanceNavigationBinding::Wrap(cx, this, aGivenProto);
+}
+
+uint16_t
+PerformanceNavigation::RedirectCount() const
+{
+  return GetPerformanceTiming()->GetRedirectCount();
+}
+
+} // dom namespace
+} // mozilla namespace
diff --git a/dom/performance/PerformanceNavigation.h b/dom/performance/PerformanceNavigation.h
new file mode 100644
index 000000000..ee49b6b12
--- /dev/null
+++ b/dom/performance/PerformanceNavigation.h
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_PerformanceNavigation_h
+#define mozilla_dom_PerformanceNavigation_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/Performance.h"
+#include "nsDOMNavigationTiming.h"
+#include "nsWrapperCache.h"
+
+namespace mozilla {
+namespace dom {
+
+// Script "performance.navigation" object
+class PerformanceNavigation final : public nsWrapperCache
+{
+public:
+  explicit PerformanceNavigation(Performance* aPerformance);
+
+  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(PerformanceNavigation)
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(PerformanceNavigation)
+
+  nsDOMNavigationTiming* GetDOMTiming() const
+  {
+    return mPerformance->GetDOMTiming();
+  }
+
+  PerformanceTiming* GetPerformanceTiming() const
+  {
+    return mPerformance->Timing();
+  }
+
+  Performance* GetParentObject() const
+  {
+    return mPerformance;
+  }
+
+  virtual JSObject* WrapObject(JSContext *cx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  // PerformanceNavigation WebIDL methods
+  uint16_t Type() const
+  {
+    return GetDOMTiming()->GetType();
+  }
+
+  uint16_t RedirectCount() const;
+
+private:
+  ~PerformanceNavigation();
+  RefPtr<Performance> mPerformance;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_PerformanceNavigation_h
diff --git a/dom/performance/PerformanceObserver.cpp b/dom/performance/PerformanceObserver.cpp
new file mode 100644
index 000000000..11dd30ac2
--- /dev/null
+++ b/dom/performance/PerformanceObserver.cpp
@@ -0,0 +1,184 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PerformanceObserver.h"
+
+#include "mozilla/dom/Performance.h"
+#include "mozilla/dom/PerformanceBinding.h"
+#include "mozilla/dom/PerformanceEntryBinding.h"
+#include "mozilla/dom/PerformanceObserverBinding.h"
+#include "nsPIDOMWindow.h"
+#include "nsQueryObject.h"
+#include "nsString.h"
+#include "PerformanceEntry.h"
+#include "PerformanceObserverEntryList.h"
+#include "WorkerPrivate.h"
+#include "WorkerScope.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace mozilla::dom::workers;
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(PerformanceObserver)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(PerformanceObserver)
+  tmp->Disconnect();
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mCallback)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mPerformance)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(PerformanceObserver)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCallback)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPerformance)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(PerformanceObserver)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(PerformanceObserver)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(PerformanceObserver)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PerformanceObserver)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+PerformanceObserver::PerformanceObserver(nsPIDOMWindowInner* aOwner,
+                                         PerformanceObserverCallback& aCb)
+  : mOwner(aOwner)
+  , mCallback(&aCb)
+  , mConnected(false)
+{
+  MOZ_ASSERT(mOwner);
+  mPerformance = aOwner->GetPerformance();
+}
+
+PerformanceObserver::PerformanceObserver(WorkerPrivate* aWorkerPrivate,
+                                         PerformanceObserverCallback& aCb)
+  : mCallback(&aCb)
+  , mConnected(false)
+{
+  MOZ_ASSERT(aWorkerPrivate);
+  mPerformance = aWorkerPrivate->GlobalScope()->GetPerformance();
+}
+
+PerformanceObserver::~PerformanceObserver()
+{
+  Disconnect();
+  MOZ_ASSERT(!mConnected);
+}
+
+// static
+already_AddRefed<PerformanceObserver>
+PerformanceObserver::Constructor(const GlobalObject& aGlobal,
+                                 PerformanceObserverCallback& aCb,
+                                 ErrorResult& aRv)
+{
+  if (NS_IsMainThread()) {
+    nsCOMPtr<nsPIDOMWindowInner> ownerWindow =
+      do_QueryInterface(aGlobal.GetAsSupports());
+    if (!ownerWindow) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return nullptr;
+    }
+    MOZ_ASSERT(ownerWindow->IsInnerWindow());
+
+    RefPtr<PerformanceObserver> observer =
+      new PerformanceObserver(ownerWindow, aCb);
+    return observer.forget();
+  }
+
+  JSContext* cx = aGlobal.Context();
+  WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(cx);
+  MOZ_ASSERT(workerPrivate);
+
+  RefPtr<PerformanceObserver> observer =
+    new PerformanceObserver(workerPrivate, aCb);
+  return observer.forget();
+}
+
+JSObject*
+PerformanceObserver::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return PerformanceObserverBinding::Wrap(aCx, this, aGivenProto);
+}
+
+void
+PerformanceObserver::Notify()
+{
+  if (mQueuedEntries.IsEmpty()) {
+    return;
+  }
+  RefPtr<PerformanceObserverEntryList> list =
+    new PerformanceObserverEntryList(this, mQueuedEntries);
+
+  ErrorResult rv;
+  mCallback->Call(this, *list, *this, rv);
+  if (NS_WARN_IF(rv.Failed())) {
+    rv.SuppressException();
+  }
+  mQueuedEntries.Clear();
+}
+
+void
+PerformanceObserver::QueueEntry(PerformanceEntry* aEntry)
+{
+  MOZ_ASSERT(aEntry);
+
+  nsAutoString entryType;
+  aEntry->GetEntryType(entryType);
+  if (!mEntryTypes.Contains<nsString>(entryType)) {
+    return;
+  }
+
+  mQueuedEntries.AppendElement(aEntry);
+}
+
+static const char16_t *const sValidTypeNames[4] = {
+  u"mark",
+  u"measure",
+  u"resource",
+  u"server"
+};
+
+void
+PerformanceObserver::Observe(const PerformanceObserverInit& aOptions,
+                             ErrorResult& aRv)
+{
+  if (aOptions.mEntryTypes.IsEmpty()) {
+    aRv.Throw(NS_ERROR_DOM_TYPE_ERR);
+    return;
+  }
+
+  nsTArray<nsString> validEntryTypes;
+
+  for (const char16_t* name : sValidTypeNames) {
+    nsDependentString validTypeName(name);
+    if (aOptions.mEntryTypes.Contains<nsString>(validTypeName) &&
+        !validEntryTypes.Contains<nsString>(validTypeName)) {
+      validEntryTypes.AppendElement(validTypeName);
+    }
+  }
+
+  if (validEntryTypes.IsEmpty()) {
+    aRv.Throw(NS_ERROR_DOM_TYPE_ERR);
+    return;
+  }
+
+  mEntryTypes.SwapElements(validEntryTypes);
+
+  mPerformance->AddObserver(this);
+  mConnected = true;
+}
+
+void
+PerformanceObserver::Disconnect()
+{
+  if (mConnected) {
+    MOZ_ASSERT(mPerformance);
+    mPerformance->RemoveObserver(this);
+    mConnected = false;
+  }
+}
diff --git a/dom/performance/PerformanceObserver.h b/dom/performance/PerformanceObserver.h
new file mode 100644
index 000000000..a02c960cd
--- /dev/null
+++ b/dom/performance/PerformanceObserver.h
@@ -0,0 +1,79 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_PerformanceObserver_h__
+#define mozilla_dom_PerformanceObserver_h__
+
+#include "nsCOMPtr.h"
+#include "nsISupports.h"
+#include "mozilla/RefPtr.h"
+#include "nsString.h"
+#include "nsTArray.h"
+#include "nsWrapperCache.h"
+
+class nsPIDOMWindowInner;
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace dom {
+
+class GlobalObject;
+class Performance;
+class PerformanceEntry;
+class PerformanceObserverCallback;
+struct PerformanceObserverInit;
+namespace workers {
+class WorkerPrivate;
+} // namespace workers
+
+class PerformanceObserver final : public nsISupports,
+                                  public nsWrapperCache
+{
+public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(PerformanceObserver)
+
+  static already_AddRefed<PerformanceObserver>
+  Constructor(const GlobalObject& aGlobal,
+              PerformanceObserverCallback& aCb,
+              ErrorResult& aRv);
+
+  PerformanceObserver(nsPIDOMWindowInner* aOwner,
+                      PerformanceObserverCallback& aCb);
+
+  PerformanceObserver(workers::WorkerPrivate* aWorkerPrivate,
+                      PerformanceObserverCallback& aCb);
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  nsISupports* GetParentObject() const { return mOwner; }
+
+  void Observe(const PerformanceObserverInit& aOptions,
+               mozilla::ErrorResult& aRv);
+
+  void Disconnect();
+
+  void Notify();
+  void QueueEntry(PerformanceEntry* aEntry);
+
+private:
+  ~PerformanceObserver();
+
+  nsCOMPtr<nsISupports> mOwner;
+  RefPtr<PerformanceObserverCallback> mCallback;
+  RefPtr<Performance> mPerformance;
+  nsTArray<nsString> mEntryTypes;
+  bool mConnected;
+  nsTArray<RefPtr<PerformanceEntry>> mQueuedEntries;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif
diff --git a/dom/performance/PerformanceObserverEntryList.cpp b/dom/performance/PerformanceObserverEntryList.cpp
new file mode 100644
index 000000000..349103f08
--- /dev/null
+++ b/dom/performance/PerformanceObserverEntryList.cpp
@@ -0,0 +1,96 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PerformanceObserverEntryList.h"
+
+#include "mozilla/dom/Performance.h"
+#include "mozilla/dom/PerformanceObserverEntryListBinding.h"
+#include "nsString.h"
+#include "PerformanceResourceTiming.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(PerformanceObserverEntryList,
+                                      mOwner,
+                                      mEntries)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(PerformanceObserverEntryList)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(PerformanceObserverEntryList)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PerformanceObserverEntryList)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+PerformanceObserverEntryList::~PerformanceObserverEntryList()
+{
+}
+
+JSObject*
+PerformanceObserverEntryList::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return PerformanceObserverEntryListBinding::Wrap(aCx, this, aGivenProto);
+}
+
+void
+PerformanceObserverEntryList::GetEntries(
+  const PerformanceEntryFilterOptions& aFilter,
+  nsTArray<RefPtr<PerformanceEntry>>& aRetval)
+{
+  aRetval.Clear();
+  for (const RefPtr<PerformanceEntry>& entry : mEntries) {
+    if (aFilter.mInitiatorType.WasPassed()) {
+      const PerformanceResourceTiming* resourceEntry =
+        entry->ToResourceTiming();
+      if (!resourceEntry) {
+        continue;
+      }
+      nsAutoString initiatorType;
+      resourceEntry->GetInitiatorType(initiatorType);
+      if (!initiatorType.Equals(aFilter.mInitiatorType.Value())) {
+        continue;
+      }
+    }
+    if (aFilter.mName.WasPassed() &&
+        !entry->GetName().Equals(aFilter.mName.Value())) {
+      continue;
+    }
+    if (aFilter.mEntryType.WasPassed() &&
+        !entry->GetEntryType().Equals(aFilter.mEntryType.Value())) {
+      continue;
+    }
+
+    aRetval.AppendElement(entry);
+  }
+}
+
+void
+PerformanceObserverEntryList::GetEntriesByType(
+  const nsAString& aEntryType,
+  nsTArray<RefPtr<PerformanceEntry>>& aRetval)
+{
+  aRetval.Clear();
+  for (const RefPtr<PerformanceEntry>& entry : mEntries) {
+    if (entry->GetEntryType().Equals(aEntryType)) {
+      aRetval.AppendElement(entry);
+    }
+  }
+}
+
+void
+PerformanceObserverEntryList::GetEntriesByName(
+  const nsAString& aName,
+  const Optional<nsAString>& aEntryType,
+  nsTArray<RefPtr<PerformanceEntry>>& aRetval)
+{
+  aRetval.Clear();
+  for (const RefPtr<PerformanceEntry>& entry : mEntries) {
+    if (entry->GetName().Equals(aName)) {
+      aRetval.AppendElement(entry);
+    }
+  }
+}
diff --git a/dom/performance/PerformanceObserverEntryList.h b/dom/performance/PerformanceObserverEntryList.h
new file mode 100644
index 000000000..e78ce7dfb
--- /dev/null
+++ b/dom/performance/PerformanceObserverEntryList.h
@@ -0,0 +1,65 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_PerformanceObserverEntryList_h__
+#define mozilla_dom_PerformanceObserverEntryList_h__
+
+#include "nsCOMPtr.h"
+#include "nsISupports.h"
+#include "nsTArray.h"
+#include "nsWrapperCache.h"
+#include "mozilla/dom/PerformanceEntryBinding.h"
+
+namespace mozilla {
+namespace dom {
+
+struct PerformanceEntryFilterOptions;
+class PerformanceEntry;
+template<typename T> class Optional;
+
+class PerformanceObserverEntryList final : public nsISupports,
+                                           public nsWrapperCache
+{
+  ~PerformanceObserverEntryList();
+
+public:
+  PerformanceObserverEntryList(nsISupports* aOwner,
+                               nsTArray<RefPtr<PerformanceEntry>>&
+                               aEntries)
+    : mOwner(aOwner)
+    , mEntries(aEntries)
+  {
+  }
+
+  nsISupports* GetParentObject() const
+  {
+    return mOwner;
+  }
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(PerformanceObserverEntryList)
+
+  void GetEntries(const PerformanceEntryFilterOptions& aFilter,
+                  nsTArray<RefPtr<PerformanceEntry>>& aRetval);
+  void GetEntriesByType(const nsAString& aEntryType,
+                        nsTArray<RefPtr<PerformanceEntry>>& aRetval);
+  void GetEntriesByName(const nsAString& aName,
+                        const Optional<nsAString>& aEntryType,
+                        nsTArray<RefPtr<PerformanceEntry>>& aRetval);
+
+private:
+  nsCOMPtr<nsISupports> mOwner;
+  nsTArray<RefPtr<PerformanceEntry>> mEntries;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+
+#endif
diff --git a/dom/performance/PerformanceResourceTiming.cpp b/dom/performance/PerformanceResourceTiming.cpp
new file mode 100644
index 000000000..60a20ca28
--- /dev/null
+++ b/dom/performance/PerformanceResourceTiming.cpp
@@ -0,0 +1,53 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PerformanceResourceTiming.h"
+#include "mozilla/dom/PerformanceResourceTimingBinding.h"
+
+using namespace mozilla::dom;
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(PerformanceResourceTiming,
+                                   PerformanceEntry,
+                                   mTiming)
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(PerformanceResourceTiming,
+                                               PerformanceEntry)
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(PerformanceResourceTiming)
+NS_INTERFACE_MAP_END_INHERITING(PerformanceEntry)
+
+NS_IMPL_ADDREF_INHERITED(PerformanceResourceTiming, PerformanceEntry)
+NS_IMPL_RELEASE_INHERITED(PerformanceResourceTiming, PerformanceEntry)
+
+PerformanceResourceTiming::PerformanceResourceTiming(PerformanceTiming* aPerformanceTiming,
+                                                     Performance* aPerformance,
+                                                     const nsAString& aName)
+: PerformanceEntry(aPerformance, aName, NS_LITERAL_STRING("resource")),
+  mTiming(aPerformanceTiming),
+  mEncodedBodySize(0),
+  mTransferSize(0),
+  mDecodedBodySize(0)
+{
+  MOZ_ASSERT(aPerformance, "Parent performance object should be provided");
+}
+
+PerformanceResourceTiming::~PerformanceResourceTiming()
+{
+}
+
+DOMHighResTimeStamp
+PerformanceResourceTiming::StartTime() const
+{
+  DOMHighResTimeStamp startTime = mTiming->RedirectStartHighRes();
+  return startTime ? startTime : mTiming->FetchStartHighRes();
+}
+
+JSObject*
+PerformanceResourceTiming::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return PerformanceResourceTimingBinding::Wrap(aCx, this, aGivenProto);
+}
diff --git a/dom/performance/PerformanceResourceTiming.h b/dom/performance/PerformanceResourceTiming.h
new file mode 100644
index 000000000..abb653d66
--- /dev/null
+++ b/dom/performance/PerformanceResourceTiming.h
@@ -0,0 +1,185 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_PerformanceResourceTiming_h___
+#define mozilla_dom_PerformanceResourceTiming_h___
+
+#include "nsCOMPtr.h"
+#include "nsIChannel.h"
+#include "nsITimedChannel.h"
+#include "Performance.h"
+#include "PerformanceEntry.h"
+#include "PerformanceTiming.h"
+
+namespace mozilla {
+namespace dom {
+
+// http://www.w3.org/TR/resource-timing/#performanceresourcetiming
+class PerformanceResourceTiming final : public PerformanceEntry
+{
+public:
+  typedef mozilla::TimeStamp TimeStamp;
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(
+      PerformanceResourceTiming,
+      PerformanceEntry)
+
+  PerformanceResourceTiming(PerformanceTiming* aPerformanceTiming,
+                            Performance* aPerformance,
+                            const nsAString& aName);
+
+  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+
+
+  virtual DOMHighResTimeStamp StartTime() const override;
+
+  virtual DOMHighResTimeStamp Duration() const override
+  {
+    return ResponseEnd() - StartTime();
+  }
+
+  void GetInitiatorType(nsAString& aInitiatorType) const
+  {
+    aInitiatorType = mInitiatorType;
+  }
+
+  void SetInitiatorType(const nsAString& aInitiatorType)
+  {
+    mInitiatorType = aInitiatorType;
+  }
+
+  void GetNextHopProtocol(nsAString& aNextHopProtocol) const
+  {
+    aNextHopProtocol = mNextHopProtocol;
+  }
+
+  void SetNextHopProtocol(const nsAString& aNextHopProtocol)
+  {
+    mNextHopProtocol = aNextHopProtocol;
+  }
+
+  DOMHighResTimeStamp FetchStart() const {
+    return mTiming
+        ? mTiming->FetchStartHighRes()
+        : 0;
+  }
+
+  DOMHighResTimeStamp RedirectStart() const {
+    // We have to check if all the redirect URIs had the same origin (since
+    // there is no check in RedirectEndHighRes())
+    return mTiming && mTiming->ShouldReportCrossOriginRedirect()
+        ? mTiming->RedirectStartHighRes()
+        : 0;
+  }
+
+  DOMHighResTimeStamp RedirectEnd() const {
+    // We have to check if all the redirect URIs had the same origin (since
+    // there is no check in RedirectEndHighRes())
+    return mTiming && mTiming->ShouldReportCrossOriginRedirect()
+        ? mTiming->RedirectEndHighRes()
+        : 0;
+  }
+
+  DOMHighResTimeStamp DomainLookupStart() const {
+    return mTiming && mTiming->TimingAllowed()
+        ? mTiming->DomainLookupStartHighRes()
+        : 0;
+  }
+
+  DOMHighResTimeStamp DomainLookupEnd() const {
+    return mTiming && mTiming->TimingAllowed()
+        ? mTiming->DomainLookupEndHighRes()
+        : 0;
+  }
+
+  DOMHighResTimeStamp ConnectStart() const {
+    return mTiming && mTiming->TimingAllowed()
+        ? mTiming->ConnectStartHighRes()
+        : 0;
+  }
+
+  DOMHighResTimeStamp ConnectEnd() const {
+    return mTiming && mTiming->TimingAllowed()
+        ? mTiming->ConnectEndHighRes()
+        : 0;
+  }
+
+  DOMHighResTimeStamp RequestStart() const {
+    return mTiming && mTiming->TimingAllowed()
+        ? mTiming->RequestStartHighRes()
+        : 0;
+  }
+
+  DOMHighResTimeStamp ResponseStart() const {
+    return mTiming && mTiming->TimingAllowed()
+        ? mTiming->ResponseStartHighRes()
+        : 0;
+  }
+
+  DOMHighResTimeStamp ResponseEnd() const {
+    return mTiming
+        ? mTiming->ResponseEndHighRes()
+        : 0;
+  }
+
+  DOMHighResTimeStamp SecureConnectionStart() const
+  {
+    // This measurement is not available for Navigation Timing either.
+    // There is a different bug submitted for it.
+    return 0;
+  }
+
+  virtual const PerformanceResourceTiming* ToResourceTiming() const override
+  {
+    return this;
+  }
+
+  uint64_t TransferSize() const
+  {
+    return mTiming && mTiming->TimingAllowed() ? mTransferSize : 0;
+  }
+
+  uint64_t EncodedBodySize() const
+  {
+    return mTiming && mTiming->TimingAllowed() ? mEncodedBodySize : 0;
+  }
+
+  uint64_t DecodedBodySize() const
+  {
+    return mTiming && mTiming->TimingAllowed() ? mDecodedBodySize : 0;
+  }
+
+  void SetEncodedBodySize(uint64_t aEncodedBodySize)
+  {
+    mEncodedBodySize = aEncodedBodySize;
+  }
+
+  void SetTransferSize(uint64_t aTransferSize)
+  {
+    mTransferSize = aTransferSize;
+  }
+
+  void SetDecodedBodySize(uint64_t aDecodedBodySize)
+  {
+    mDecodedBodySize = aDecodedBodySize;
+  }
+
+protected:
+  virtual ~PerformanceResourceTiming();
+
+  nsString mInitiatorType;
+  nsString mNextHopProtocol;
+  RefPtr<PerformanceTiming> mTiming;
+  uint64_t mEncodedBodySize;
+  uint64_t mTransferSize;
+  uint64_t mDecodedBodySize;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif /* mozilla_dom_PerformanceResourceTiming_h___ */
diff --git a/dom/performance/PerformanceTiming.cpp b/dom/performance/PerformanceTiming.cpp
new file mode 100644
index 000000000..527cf9441
--- /dev/null
+++ b/dom/performance/PerformanceTiming.cpp
@@ -0,0 +1,361 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PerformanceTiming.h"
+#include "mozilla/dom/PerformanceTimingBinding.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(PerformanceTiming, mPerformance)
+
+NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(PerformanceTiming, AddRef)
+NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(PerformanceTiming, Release)
+
+PerformanceTiming::PerformanceTiming(Performance* aPerformance,
+                                     nsITimedChannel* aChannel,
+                                     nsIHttpChannel* aHttpChannel,
+                                     DOMHighResTimeStamp aZeroTime)
+  : mPerformance(aPerformance),
+    mFetchStart(0.0),
+    mZeroTime(aZeroTime),
+    mRedirectCount(0),
+    mTimingAllowed(true),
+    mAllRedirectsSameOrigin(true),
+    mInitialized(!!aChannel),
+    mReportCrossOriginRedirect(true)
+{
+  MOZ_ASSERT(aPerformance, "Parent performance object should be provided");
+
+  if (!nsContentUtils::IsPerformanceTimingEnabled()) {
+    mZeroTime = 0;
+  }
+
+  // The aHttpChannel argument is null if this PerformanceTiming object is
+  // being used for navigation timing (which is only relevant for documents).
+  // It has a non-null value if this PerformanceTiming object is being used
+  // for resource timing, which can include document loads, both toplevel and
+  // in subframes, and resources linked from a document.
+  if (aHttpChannel) {
+    mTimingAllowed = CheckAllowedOrigin(aHttpChannel, aChannel);
+    bool redirectsPassCheck = false;
+    aChannel->GetAllRedirectsPassTimingAllowCheck(&redirectsPassCheck);
+    mReportCrossOriginRedirect = mTimingAllowed && redirectsPassCheck;
+  }
+
+  InitializeTimingInfo(aChannel);
+}
+
+// Copy the timing info from the channel so we don't need to keep the channel
+// alive just to get the timestamps.
+void
+PerformanceTiming::InitializeTimingInfo(nsITimedChannel* aChannel)
+{
+  if (aChannel) {
+    aChannel->GetAsyncOpen(&mAsyncOpen);
+    aChannel->GetAllRedirectsSameOrigin(&mAllRedirectsSameOrigin);
+    aChannel->GetRedirectCount(&mRedirectCount);
+    aChannel->GetRedirectStart(&mRedirectStart);
+    aChannel->GetRedirectEnd(&mRedirectEnd);
+    aChannel->GetDomainLookupStart(&mDomainLookupStart);
+    aChannel->GetDomainLookupEnd(&mDomainLookupEnd);
+    aChannel->GetConnectStart(&mConnectStart);
+    aChannel->GetConnectEnd(&mConnectEnd);
+    aChannel->GetRequestStart(&mRequestStart);
+    aChannel->GetResponseStart(&mResponseStart);
+    aChannel->GetCacheReadStart(&mCacheReadStart);
+    aChannel->GetResponseEnd(&mResponseEnd);
+    aChannel->GetCacheReadEnd(&mCacheReadEnd);
+  }
+}
+
+PerformanceTiming::~PerformanceTiming()
+{
+}
+
+DOMHighResTimeStamp
+PerformanceTiming::FetchStartHighRes()
+{
+  if (!mFetchStart) {
+    if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
+      return mZeroTime;
+    }
+    MOZ_ASSERT(!mAsyncOpen.IsNull(), "The fetch start time stamp should always be "
+        "valid if the performance timing is enabled");
+    mFetchStart = (!mAsyncOpen.IsNull())
+        ? TimeStampToDOMHighRes(mAsyncOpen)
+        : 0.0;
+  }
+  return mFetchStart;
+}
+
+DOMTimeMilliSec
+PerformanceTiming::FetchStart()
+{
+  return static_cast<int64_t>(FetchStartHighRes());
+}
+
+bool
+PerformanceTiming::CheckAllowedOrigin(nsIHttpChannel* aResourceChannel,
+                                      nsITimedChannel* aChannel)
+{
+  if (!IsInitialized()) {
+    return false;
+  }
+
+  // Check that the current document passes the ckeck.
+  nsCOMPtr<nsILoadInfo> loadInfo;
+  aResourceChannel->GetLoadInfo(getter_AddRefs(loadInfo));
+  if (!loadInfo) {
+    return false;
+  }
+
+  // TYPE_DOCUMENT loads have no loadingPrincipal.  And that's OK, because we
+  // never actually need to have a performance timing entry for TYPE_DOCUMENT
+  // loads.
+  if (loadInfo->GetExternalContentPolicyType() == nsIContentPolicy::TYPE_DOCUMENT) {
+    return false;
+  }
+
+  nsCOMPtr<nsIPrincipal> principal = loadInfo->LoadingPrincipal();
+
+  // Check if the resource is either same origin as the page that started
+  // the load, or if the response contains the proper Timing-Allow-Origin
+  // header with the domain of the page that started the load.
+  return aChannel->TimingAllowCheck(principal);
+}
+
+bool
+PerformanceTiming::TimingAllowed() const
+{
+  return mTimingAllowed;
+}
+
+uint16_t
+PerformanceTiming::GetRedirectCount() const
+{
+  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
+    return 0;
+  }
+  if (!mAllRedirectsSameOrigin) {
+    return 0;
+  }
+  return mRedirectCount;
+}
+
+bool
+PerformanceTiming::ShouldReportCrossOriginRedirect() const
+{
+  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
+    return false;
+  }
+
+  // If the redirect count is 0, or if one of the cross-origin
+  // redirects doesn't have the proper Timing-Allow-Origin header,
+  // then RedirectStart and RedirectEnd will be set to zero
+  return (mRedirectCount != 0) && mReportCrossOriginRedirect;
+}
+
+/**
+ * RedirectStartHighRes() is used by both the navigation timing and the
+ * resource timing. Since, navigation timing and resource timing check and
+ * interpret cross-domain redirects in a different manner,
+ * RedirectStartHighRes() will make no checks for cross-domain redirect.
+ * It's up to the consumers of this method (PerformanceTiming::RedirectStart()
+ * and PerformanceResourceTiming::RedirectStart() to make such verifications.
+ *
+ * @return a valid timing if the Performance Timing is enabled
+ */
+DOMHighResTimeStamp
+PerformanceTiming::RedirectStartHighRes()
+{
+  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
+    return mZeroTime;
+  }
+  return TimeStampToDOMHighResOrFetchStart(mRedirectStart);
+}
+
+DOMTimeMilliSec
+PerformanceTiming::RedirectStart()
+{
+  if (!IsInitialized()) {
+    return 0;
+  }
+  // We have to check if all the redirect URIs had the same origin (since there
+  // is no check in RedirectStartHighRes())
+  if (mAllRedirectsSameOrigin && mRedirectCount) {
+    return static_cast<int64_t>(RedirectStartHighRes());
+  }
+  return 0;
+}
+
+/**
+ * RedirectEndHighRes() is used by both the navigation timing and the resource
+ * timing. Since, navigation timing and resource timing check and interpret
+ * cross-domain redirects in a different manner, RedirectEndHighRes() will make
+ * no checks for cross-domain redirect. It's up to the consumers of this method
+ * (PerformanceTiming::RedirectEnd() and
+ * PerformanceResourceTiming::RedirectEnd() to make such verifications.
+ *
+ * @return a valid timing if the Performance Timing is enabled
+ */
+DOMHighResTimeStamp
+PerformanceTiming::RedirectEndHighRes()
+{
+  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
+    return mZeroTime;
+  }
+  return TimeStampToDOMHighResOrFetchStart(mRedirectEnd);
+}
+
+DOMTimeMilliSec
+PerformanceTiming::RedirectEnd()
+{
+  if (!IsInitialized()) {
+    return 0;
+  }
+  // We have to check if all the redirect URIs had the same origin (since there
+  // is no check in RedirectEndHighRes())
+  if (mAllRedirectsSameOrigin && mRedirectCount) {
+    return static_cast<int64_t>(RedirectEndHighRes());
+  }
+  return 0;
+}
+
+DOMHighResTimeStamp
+PerformanceTiming::DomainLookupStartHighRes()
+{
+  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
+    return mZeroTime;
+  }
+  return TimeStampToDOMHighResOrFetchStart(mDomainLookupStart);
+}
+
+DOMTimeMilliSec
+PerformanceTiming::DomainLookupStart()
+{
+  return static_cast<int64_t>(DomainLookupStartHighRes());
+}
+
+DOMHighResTimeStamp
+PerformanceTiming::DomainLookupEndHighRes()
+{
+  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
+    return mZeroTime;
+  }
+  // Bug 1155008 - nsHttpTransaction is racy. Return DomainLookupStart when null
+  return mDomainLookupEnd.IsNull() ? DomainLookupStartHighRes()
+                                   : TimeStampToDOMHighRes(mDomainLookupEnd);
+}
+
+DOMTimeMilliSec
+PerformanceTiming::DomainLookupEnd()
+{
+  return static_cast<int64_t>(DomainLookupEndHighRes());
+}
+
+DOMHighResTimeStamp
+PerformanceTiming::ConnectStartHighRes()
+{
+  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
+    return mZeroTime;
+  }
+  return mConnectStart.IsNull() ? DomainLookupEndHighRes()
+                                : TimeStampToDOMHighRes(mConnectStart);
+}
+
+DOMTimeMilliSec
+PerformanceTiming::ConnectStart()
+{
+  return static_cast<int64_t>(ConnectStartHighRes());
+}
+
+DOMHighResTimeStamp
+PerformanceTiming::ConnectEndHighRes()
+{
+  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
+    return mZeroTime;
+  }
+  // Bug 1155008 - nsHttpTransaction is racy. Return ConnectStart when null
+  return mConnectEnd.IsNull() ? ConnectStartHighRes()
+                              : TimeStampToDOMHighRes(mConnectEnd);
+}
+
+DOMTimeMilliSec
+PerformanceTiming::ConnectEnd()
+{
+  return static_cast<int64_t>(ConnectEndHighRes());
+}
+
+DOMHighResTimeStamp
+PerformanceTiming::RequestStartHighRes()
+{
+  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
+    return mZeroTime;
+  }
+  return TimeStampToDOMHighResOrFetchStart(mRequestStart);
+}
+
+DOMTimeMilliSec
+PerformanceTiming::RequestStart()
+{
+  return static_cast<int64_t>(RequestStartHighRes());
+}
+
+DOMHighResTimeStamp
+PerformanceTiming::ResponseStartHighRes()
+{
+  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
+    return mZeroTime;
+  }
+  if (mResponseStart.IsNull() ||
+     (!mCacheReadStart.IsNull() && mCacheReadStart < mResponseStart)) {
+    mResponseStart = mCacheReadStart;
+  }
+  return TimeStampToDOMHighResOrFetchStart(mResponseStart);
+}
+
+DOMTimeMilliSec
+PerformanceTiming::ResponseStart()
+{
+  return static_cast<int64_t>(ResponseStartHighRes());
+}
+
+DOMHighResTimeStamp
+PerformanceTiming::ResponseEndHighRes()
+{
+  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
+    return mZeroTime;
+  }
+  if (mResponseEnd.IsNull() ||
+     (!mCacheReadEnd.IsNull() && mCacheReadEnd < mResponseEnd)) {
+    mResponseEnd = mCacheReadEnd;
+  }
+  // Bug 1155008 - nsHttpTransaction is racy. Return ResponseStart when null
+  return mResponseEnd.IsNull() ? ResponseStartHighRes()
+                               : TimeStampToDOMHighRes(mResponseEnd);
+}
+
+DOMTimeMilliSec
+PerformanceTiming::ResponseEnd()
+{
+  return static_cast<int64_t>(ResponseEndHighRes());
+}
+
+bool
+PerformanceTiming::IsInitialized() const
+{
+  return mInitialized;
+}
+
+JSObject*
+PerformanceTiming::WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto)
+{
+  return PerformanceTimingBinding::Wrap(cx, this, aGivenProto);
+}
+
+} // dom namespace
+} // mozilla namespace
diff --git a/dom/performance/PerformanceTiming.h b/dom/performance/PerformanceTiming.h
new file mode 100644
index 000000000..aef54a258
--- /dev/null
+++ b/dom/performance/PerformanceTiming.h
@@ -0,0 +1,278 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_PerformanceTiming_h
+#define mozilla_dom_PerformanceTiming_h
+
+#include "mozilla/Attributes.h"
+#include "nsContentUtils.h"
+#include "nsDOMNavigationTiming.h"
+#include "nsWrapperCache.h"
+#include "Performance.h"
+
+class nsIHttpChannel;
+class nsITimedChannel;
+
+namespace mozilla {
+namespace dom {
+
+// Script "performance.timing" object
+class PerformanceTiming final : public nsWrapperCache
+{
+public:
+/**
+ * @param   aPerformance
+ *          The performance object (the JS parent).
+ *          This will allow access to "window.performance.timing" attribute for
+ *          the navigation timing (can't be null).
+ * @param   aChannel
+ *          An nsITimedChannel used to gather all the networking timings by both
+ *          the navigation timing and the resource timing (can't be null).
+ * @param   aHttpChannel
+ *          An nsIHttpChannel (the resource's http channel).
+ *          This will be used by the resource timing cross-domain check
+ *          algorithm.
+ *          Argument is null for the navigation timing (navigation timing uses
+ *          another algorithm for the cross-domain redirects).
+ * @param   aZeroTime
+ *          The offset that will be added to the timestamp of each event. This
+ *          argument should be equal to performance.navigationStart for
+ *          navigation timing and "0" for the resource timing.
+ */
+  PerformanceTiming(Performance* aPerformance,
+                    nsITimedChannel* aChannel,
+                    nsIHttpChannel* aHttpChannel,
+                    DOMHighResTimeStamp aZeroTime);
+  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(PerformanceTiming)
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(PerformanceTiming)
+
+  nsDOMNavigationTiming* GetDOMTiming() const
+  {
+    return mPerformance->GetDOMTiming();
+  }
+
+  Performance* GetParentObject() const
+  {
+    return mPerformance;
+  }
+
+  /**
+   * @param   aStamp
+   *          The TimeStamp recorded for a specific event. This TimeStamp can
+   *          be null.
+   * @return  the duration of an event with a given TimeStamp, relative to the
+   *          navigationStart TimeStamp (the moment the user landed on the
+   *          page), if the given TimeStamp is valid. Otherwise, it will return
+   *          the FetchStart timing value.
+   */
+  inline DOMHighResTimeStamp TimeStampToDOMHighResOrFetchStart(TimeStamp aStamp)
+  {
+    return (!aStamp.IsNull())
+        ? TimeStampToDOMHighRes(aStamp)
+        : FetchStartHighRes();
+  }
+
+  /**
+   * The nsITimedChannel records an absolute timestamp for each event.
+   * The nsDOMNavigationTiming will record the moment when the user landed on
+   * the page. This is a window.performance unique timestamp, so it can be used
+   * for all the events (navigation timing and resource timing events).
+   *
+   * The algorithm operates in 2 steps:
+   * 1. The first step is to subtract the two timestamps: the argument (the
+   * envet's timesramp) and the navigation start timestamp. This will result in
+   * a relative timestamp of the event (relative to the navigation start -
+   * window.performance.timing.navigationStart).
+   * 2. The second step is to add any required offset (the mZeroTime). For now,
+   * this offset value is either 0 (for the resource timing), or equal to
+   * "performance.navigationStart" (for navigation timing).
+   * For the resource timing, mZeroTime is set to 0, causing the result to be a
+   * relative time.
+   * For the navigation timing, mZeroTime is set to "performance.navigationStart"
+   * causing the result be an absolute time.
+   *
+   * @param   aStamp
+   *          The TimeStamp recorded for a specific event. This TimeStamp can't
+   *          be null.
+   * @return  number of milliseconds value as one of:
+   * - relative to the navigation start time, time the user has landed on the
+   * page
+   * - an absolute wall clock time since the unix epoch
+   */
+  inline DOMHighResTimeStamp TimeStampToDOMHighRes(TimeStamp aStamp) const
+  {
+    MOZ_ASSERT(!aStamp.IsNull());
+    TimeDuration duration =
+        aStamp - GetDOMTiming()->GetNavigationStartTimeStamp();
+    return duration.ToMilliseconds() + mZeroTime;
+  }
+
+  virtual JSObject* WrapObject(JSContext *cx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  // PerformanceNavigation WebIDL methods
+  DOMTimeMilliSec NavigationStart() const
+  {
+    if (!nsContentUtils::IsPerformanceTimingEnabled()) {
+      return 0;
+    }
+    return GetDOMTiming()->GetNavigationStart();
+  }
+
+  DOMTimeMilliSec UnloadEventStart()
+  {
+    if (!nsContentUtils::IsPerformanceTimingEnabled()) {
+      return 0;
+    }
+    return GetDOMTiming()->GetUnloadEventStart();
+  }
+
+  DOMTimeMilliSec UnloadEventEnd()
+  {
+    if (!nsContentUtils::IsPerformanceTimingEnabled()) {
+      return 0;
+    }
+    return GetDOMTiming()->GetUnloadEventEnd();
+  }
+
+  uint16_t GetRedirectCount() const;
+
+  // Checks if the resource is either same origin as the page that started
+  // the load, or if the response contains the Timing-Allow-Origin header
+  // with a value of * or matching the domain of the loading Principal
+  bool CheckAllowedOrigin(nsIHttpChannel* aResourceChannel, nsITimedChannel* aChannel);
+
+  // Cached result of CheckAllowedOrigin. If false, security sensitive
+  // attributes of the resourceTiming object will be set to 0
+  bool TimingAllowed() const;
+
+  // If this is false the values of redirectStart/End will be 0
+  // This is false if no redirects occured, or if any of the responses failed
+  // the timing-allow-origin check in HttpBaseChannel::TimingAllowCheck
+  bool ShouldReportCrossOriginRedirect() const;
+
+  // High resolution (used by resource timing)
+  DOMHighResTimeStamp FetchStartHighRes();
+  DOMHighResTimeStamp RedirectStartHighRes();
+  DOMHighResTimeStamp RedirectEndHighRes();
+  DOMHighResTimeStamp DomainLookupStartHighRes();
+  DOMHighResTimeStamp DomainLookupEndHighRes();
+  DOMHighResTimeStamp ConnectStartHighRes();
+  DOMHighResTimeStamp ConnectEndHighRes();
+  DOMHighResTimeStamp RequestStartHighRes();
+  DOMHighResTimeStamp ResponseStartHighRes();
+  DOMHighResTimeStamp ResponseEndHighRes();
+
+  // Low resolution (used by navigation timing)
+  DOMTimeMilliSec FetchStart();
+  DOMTimeMilliSec RedirectStart();
+  DOMTimeMilliSec RedirectEnd();
+  DOMTimeMilliSec DomainLookupStart();
+  DOMTimeMilliSec DomainLookupEnd();
+  DOMTimeMilliSec ConnectStart();
+  DOMTimeMilliSec ConnectEnd();
+  DOMTimeMilliSec RequestStart();
+  DOMTimeMilliSec ResponseStart();
+  DOMTimeMilliSec ResponseEnd();
+
+  DOMTimeMilliSec DomLoading()
+  {
+    if (!nsContentUtils::IsPerformanceTimingEnabled()) {
+      return 0;
+    }
+    return GetDOMTiming()->GetDomLoading();
+  }
+
+  DOMTimeMilliSec DomInteractive() const
+  {
+    if (!nsContentUtils::IsPerformanceTimingEnabled()) {
+      return 0;
+    }
+    return GetDOMTiming()->GetDomInteractive();
+  }
+
+  DOMTimeMilliSec DomContentLoadedEventStart() const
+  {
+    if (!nsContentUtils::IsPerformanceTimingEnabled()) {
+      return 0;
+    }
+    return GetDOMTiming()->GetDomContentLoadedEventStart();
+  }
+
+  DOMTimeMilliSec DomContentLoadedEventEnd() const
+  {
+    if (!nsContentUtils::IsPerformanceTimingEnabled()) {
+      return 0;
+    }
+    return GetDOMTiming()->GetDomContentLoadedEventEnd();
+  }
+
+  DOMTimeMilliSec DomComplete() const
+  {
+    if (!nsContentUtils::IsPerformanceTimingEnabled()) {
+      return 0;
+    }
+    return GetDOMTiming()->GetDomComplete();
+  }
+
+  DOMTimeMilliSec LoadEventStart() const
+  {
+    if (!nsContentUtils::IsPerformanceTimingEnabled()) {
+      return 0;
+    }
+    return GetDOMTiming()->GetLoadEventStart();
+  }
+
+  DOMTimeMilliSec LoadEventEnd() const
+  {
+    if (!nsContentUtils::IsPerformanceTimingEnabled()) {
+      return 0;
+    }
+    return GetDOMTiming()->GetLoadEventEnd();
+  }
+
+private:
+  ~PerformanceTiming();
+
+  bool IsInitialized() const;
+  void InitializeTimingInfo(nsITimedChannel* aChannel);
+
+  RefPtr<Performance> mPerformance;
+  DOMHighResTimeStamp mFetchStart;
+
+  // This is an offset that will be added to each timing ([ms] resolution).
+  // There are only 2 possible values: (1) logicaly equal to navigationStart
+  // TimeStamp (results are absolute timstamps - wallclock); (2) "0" (results
+  // are relative to the navigation start).
+  DOMHighResTimeStamp mZeroTime;
+
+  TimeStamp mAsyncOpen;
+  TimeStamp mRedirectStart;
+  TimeStamp mRedirectEnd;
+  TimeStamp mDomainLookupStart;
+  TimeStamp mDomainLookupEnd;
+  TimeStamp mConnectStart;
+  TimeStamp mConnectEnd;
+  TimeStamp mRequestStart;
+  TimeStamp mResponseStart;
+  TimeStamp mCacheReadStart;
+  TimeStamp mResponseEnd;
+  TimeStamp mCacheReadEnd;
+  uint16_t mRedirectCount;
+  bool mTimingAllowed;
+  bool mAllRedirectsSameOrigin;
+  bool mInitialized;
+
+  // If the resourceTiming object should have non-zero redirectStart and
+  // redirectEnd attributes. It is false if there were no redirects, or if
+  // any of the responses didn't pass the timing-allow-check
+  bool mReportCrossOriginRedirect;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_PerformanceTiming_h
diff --git a/dom/performance/PerformanceWorker.cpp b/dom/performance/PerformanceWorker.cpp
new file mode 100644
index 000000000..85ca2ccd8
--- /dev/null
+++ b/dom/performance/PerformanceWorker.cpp
@@ -0,0 +1,85 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PerformanceWorker.h"
+#include "WorkerPrivate.h"
+
+namespace mozilla {
+namespace dom {
+
+using namespace workers;
+
+PerformanceWorker::PerformanceWorker(WorkerPrivate* aWorkerPrivate)
+  : mWorkerPrivate(aWorkerPrivate)
+{
+  mWorkerPrivate->AssertIsOnWorkerThread();
+}
+
+PerformanceWorker::~PerformanceWorker()
+{
+  mWorkerPrivate->AssertIsOnWorkerThread();
+}
+
+DOMHighResTimeStamp
+PerformanceWorker::Now() const
+{
+  TimeDuration duration =
+    TimeStamp::Now() - mWorkerPrivate->NowBaseTimeStamp();
+  return RoundTime(duration.ToMilliseconds());
+}
+
+// To be removed once bug 1124165 lands
+bool
+PerformanceWorker::IsPerformanceTimingAttribute(const nsAString& aName)
+{
+  // In workers we just support navigationStart.
+  return aName.EqualsASCII("navigationStart");
+}
+
+DOMHighResTimeStamp
+PerformanceWorker::GetPerformanceTimingFromString(const nsAString& aProperty)
+{
+  if (!IsPerformanceTimingAttribute(aProperty)) {
+    return 0;
+  }
+
+  if (aProperty.EqualsLiteral("navigationStart")) {
+    return mWorkerPrivate->NowBaseTime();
+  }
+
+  MOZ_CRASH("IsPerformanceTimingAttribute and GetPerformanceTimingFromString are out of sync");
+  return 0;
+}
+
+void
+PerformanceWorker::InsertUserEntry(PerformanceEntry* aEntry)
+{
+  if (mWorkerPrivate->PerformanceLoggingEnabled()) {
+    nsAutoCString uri;
+    nsCOMPtr<nsIURI> scriptURI = mWorkerPrivate->GetResolvedScriptURI();
+    if (!scriptURI || NS_FAILED(scriptURI->GetHost(uri))) {
+      // If we have no URI, just put in "none".
+      uri.AssignLiteral("none");
+    }
+    Performance::LogEntry(aEntry, uri);
+  }
+  Performance::InsertUserEntry(aEntry);
+}
+
+TimeStamp
+PerformanceWorker::CreationTimeStamp() const
+{
+  return mWorkerPrivate->NowBaseTimeStamp();
+}
+
+DOMHighResTimeStamp
+PerformanceWorker::CreationTime() const
+{
+  return mWorkerPrivate->NowBaseTime();
+}
+
+} // dom namespace
+} // mozilla namespace
diff --git a/dom/performance/PerformanceWorker.h b/dom/performance/PerformanceWorker.h
new file mode 100644
index 000000000..7eef0d974
--- /dev/null
+++ b/dom/performance/PerformanceWorker.h
@@ -0,0 +1,100 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_PerformanceWorker_h
+#define mozilla_dom_PerformanceWorker_h
+
+#include "Performance.h"
+
+namespace mozilla {
+namespace dom {
+
+namespace workers {
+class WorkerPrivate;
+}
+
+class PerformanceWorker final : public Performance
+{
+public:
+  explicit PerformanceWorker(workers::WorkerPrivate* aWorkerPrivate);
+
+  // Performance WebIDL methods
+  DOMHighResTimeStamp Now() const override;
+
+  virtual PerformanceTiming* Timing() override
+  {
+    MOZ_CRASH("This should not be called on workers.");
+    return nullptr;
+  }
+
+  virtual PerformanceNavigation* Navigation() override
+  {
+    MOZ_CRASH("This should not be called on workers.");
+    return nullptr;
+  }
+
+  virtual void AddEntry(nsIHttpChannel* channel,
+                        nsITimedChannel* timedChannel) override
+  {
+    MOZ_CRASH("This should not be called on workers.");
+  }
+
+  TimeStamp CreationTimeStamp() const override;
+
+  DOMHighResTimeStamp CreationTime() const override;
+
+  virtual void GetMozMemory(JSContext *aCx,
+                            JS::MutableHandle<JSObject*> aObj) override
+  {
+    MOZ_CRASH("This should not be called on workers.");
+  }
+
+  virtual nsDOMNavigationTiming* GetDOMTiming() const override
+  {
+    MOZ_CRASH("This should not be called on workers.");
+    return nullptr;
+  }
+
+  virtual nsITimedChannel* GetChannel() const override
+  {
+    MOZ_CRASH("This should not be called on workers.");
+    return nullptr;
+  }
+
+  virtual Performance* GetParentPerformance() const override
+  {
+    MOZ_CRASH("This should not be called on workers.");
+    return nullptr;
+  }
+
+protected:
+  ~PerformanceWorker();
+
+  nsISupports* GetAsISupports() override
+  {
+    return nullptr;
+  }
+
+  void InsertUserEntry(PerformanceEntry* aEntry) override;
+
+  bool IsPerformanceTimingAttribute(const nsAString& aName) override;
+
+  DOMHighResTimeStamp
+  GetPerformanceTimingFromString(const nsAString& aTimingName) override;
+
+  void DispatchBufferFullEvent() override
+  {
+    MOZ_CRASH("This should not be called on workers.");
+  }
+
+private:
+  workers::WorkerPrivate* mWorkerPrivate;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_PerformanceWorker_h
diff --git a/dom/performance/moz.build b/dom/performance/moz.build
new file mode 100644
index 000000000..3286a0a4c
--- /dev/null
+++ b/dom/performance/moz.build
@@ -0,0 +1,39 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+EXPORTS.mozilla.dom += [
+    'Performance.h',
+    'PerformanceEntry.h',
+    'PerformanceMark.h',
+    'PerformanceMeasure.h',
+    'PerformanceNavigation.h',
+    'PerformanceObserver.h',
+    'PerformanceObserverEntryList.h',
+    'PerformanceResourceTiming.h',
+    'PerformanceTiming.h',
+]
+
+UNIFIED_SOURCES += [
+    'Performance.cpp',
+    'PerformanceEntry.cpp',
+    'PerformanceMainThread.cpp',
+    'PerformanceMark.cpp',
+    'PerformanceMeasure.cpp',
+    'PerformanceNavigation.cpp',
+    'PerformanceObserver.cpp',
+    'PerformanceObserverEntryList.cpp',
+    'PerformanceResourceTiming.cpp',
+    'PerformanceTiming.cpp',
+    'PerformanceWorker.cpp',
+]
+
+LOCAL_INCLUDES += [
+    '/dom/workers',
+]
+
+MOCHITEST_MANIFESTS += [ 'tests/mochitest.ini' ]
+
+FINAL_LIBRARY = 'xul'
diff --git a/dom/performance/tests/mochitest.ini b/dom/performance/tests/mochitest.ini
new file mode 100644
index 000000000..18f7f0e45
--- /dev/null
+++ b/dom/performance/tests/mochitest.ini
@@ -0,0 +1,17 @@
+[DEFAULT]
+support-files =
+  performance_observer.html
+  test_performance_observer.js
+  test_performance_user_timing.js
+  test_worker_performance_now.js
+  worker_performance_user_timing.js
+  worker_performance_observer.js
+  sharedworker_performance_user_timing.js
+  worker_performance_observer.html
+
+[test_performance_observer.html]
+[test_performance_user_timing.html]
+[test_worker_user_timing.html]
+[test_worker_observer.html]
+[test_sharedWorker_performance_user_timing.html]
+[test_worker_performance_now.html]
diff --git a/dom/performance/tests/performance_observer.html b/dom/performance/tests/performance_observer.html
new file mode 100644
index 000000000..b8ced9296
--- /dev/null
+++ b/dom/performance/tests/performance_observer.html
@@ -0,0 +1,74 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE html>
+<meta charset=utf-8>
+<html>
+<head>
+<title>Test for performance observer</title>
+<script>
+'use strict';
+[
+ "promise_test", "test", "setup",
+ "assert_true", "assert_equals", "assert_array_equals",
+ "assert_throws", "assert_unreached"
+].forEach(func => {
+  window[func] = opener[func].bind(opener);
+});
+function done() {
+  opener.add_completion_callback(() => {
+    self.close();
+  });
+  opener.done();
+}
+
+</script>
+<script src="test_performance_observer.js"></script>
+</head>
+<body>
+<div id="log"></div>
+<script>
+function makeXHR(aUrl) {
+  var xmlhttp = new XMLHttpRequest();
+  xmlhttp.open("get", aUrl, true);
+  xmlhttp.send();
+}
+
+promise_test(t => {
+  var promise = new Promise(resolve => {
+    performance.clearResourceTimings();
+
+    var observer = new PerformanceObserver(list => resolve(list));
+    observer.observe({entryTypes: ['resource']});
+    t.add_cleanup(() => observer.disconnect());
+  });
+
+  makeXHR("test-data.json");
+
+  return promise.then(list => {
+    assert_equals(list.getEntries().length, 1);
+    assert_array_equals(list.getEntries(),
+                        performance.getEntriesByType("resource"),
+                        "Observed 'resource' entries should equal to entries obtained by getEntriesByType.");
+
+    // getEntries filtering tests
+    assert_array_equals(list.getEntries({name: "http://mochi.test:8888/tests/dom/base/test/test-data.json"}),
+                        performance.getEntriesByName("http://mochi.test:8888/tests/dom/base/test/test-data.json"),
+                        "getEntries with name filter should return correct results.");
+    assert_array_equals(list.getEntries({entryType: "resource"}),
+                        performance.getEntriesByType("resource"),
+                        "getEntries with entryType filter should return correct results.");
+    assert_array_equals(list.getEntries({initiatorType: "xmlhttprequest"}),
+                        performance.getEntriesByType("resource"),
+                        "getEntries with initiatorType filter should return correct results.");
+    assert_array_equals(list.getEntries({initiatorType: "link"}),
+                        [],
+                        "getEntries with non-existent initiatorType filter should return an empty array.");
+  });
+}, "resource-timing test");
+
+done();
+
+</script>
+</body>
diff --git a/dom/performance/tests/sharedworker_performance_user_timing.js b/dom/performance/tests/sharedworker_performance_user_timing.js
new file mode 100644
index 000000000..ced3e95fa
--- /dev/null
+++ b/dom/performance/tests/sharedworker_performance_user_timing.js
@@ -0,0 +1,30 @@
+var port;
+
+function ok(a, msg) {
+  dump("OK: " + !!a + "  =>  " + a + " " + msg + "\n");
+  port.postMessage({type: 'status', status: !!a, msg: a + ": " + msg });
+}
+
+function is(a, b, msg) {
+  dump("IS: " + (a===b) + "  =>  " + a + " | " + b + " " + msg + "\n");
+  port.postMessage({type: 'status', status: a === b, msg: a + " === " + b + ": " + msg });
+}
+
+function isnot(a, b, msg) {
+  dump("ISNOT: " + (a===b) + "  =>  " + a + " | " + b + " " + msg + "\n");
+  port.postMessage({type: 'status', status: a != b, msg: a + " != " + b + ": " + msg });
+}
+
+importScripts('test_performance_user_timing.js');
+
+onconnect = function(evt) {
+  port = evt.ports[0];
+
+  for (var i = 0; i < steps.length; ++i) {
+    performance.clearMarks();
+    performance.clearMeasures();
+    steps[i]();
+  }
+
+  port.postMessage({type: 'finish'});
+}
diff --git a/dom/performance/tests/test_performance_observer.html b/dom/performance/tests/test_performance_observer.html
new file mode 100644
index 000000000..d36878315
--- /dev/null
+++ b/dom/performance/tests/test_performance_observer.html
@@ -0,0 +1,17 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test for performance observer</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+<script>
+'use strict';
+SpecialPowers.pushPrefEnv({"set": [["dom.enable_performance_observer", true]]},
+                          function() {
+                            window.open("performance_observer.html");
+                          });
+</script>
diff --git a/dom/performance/tests/test_performance_observer.js b/dom/performance/tests/test_performance_observer.js
new file mode 100644
index 000000000..9716570e2
--- /dev/null
+++ b/dom/performance/tests/test_performance_observer.js
@@ -0,0 +1,226 @@
+setup({ explicit_done: true });
+
+test(t => {
+  assert_throws({name: "TypeError"}, function() {
+    new PerformanceObserver();
+  }, "PerformanceObserver constructor should throw TypeError if no argument is specified.");
+
+  assert_throws({name: "TypeError"}, function() {
+    new PerformanceObserver({});
+  }, "PerformanceObserver constructor should throw TypeError if the argument is not a function.");
+}, "Test that PerformanceObserver constructor throws exception");
+
+test(t => {
+  var observer = new PerformanceObserver(() => {
+  });
+
+  assert_throws({name: "TypeError"}, function() {
+    observer.observe();
+  }, "observe() should throw TypeError exception if no option specified.");
+
+  assert_throws({name: "TypeError"}, function() {
+    observer.observe({ unsupportedAttribute: "unsupported" });
+  }, "obsrve() should throw TypeError exception if the option has no 'entryTypes' attribute.");
+
+  assert_throws({name: "TypeError"}, function() {
+    observer.observe({ entryTypes: [] });
+  }, "obsrve() should throw TypeError exception if 'entryTypes' attribute is an empty sequence.");
+
+  assert_throws({name: "TypeError"}, function() {
+    observer.observe({ entryTypes: null });
+  }, "obsrve() should throw TypeError exception if 'entryTypes' attribute is null.");
+
+  assert_throws({name: "TypeError"}, function() {
+    observer.observe({ entryTypes: ["invalid"]});
+  }, "obsrve() should throw TypeError exception if 'entryTypes' attribute value is invalid.");
+}, "Test that PerformanceObserver.observe throws exception");
+
+function promiseObserve(test, options) {
+  return new Promise(resolve => {
+    performance.clearMarks();
+    performance.clearMeasures();
+
+    var observer = new PerformanceObserver(list => resolve(list));
+    observer.observe(options);
+    test.add_cleanup(() => observer.disconnect());
+  });
+}
+
+promise_test(t => {
+  var promise = promiseObserve(t, {entryTypes: ['mark', 'measure']});
+
+  performance.mark("test-start");
+  performance.mark("test-end");
+  performance.measure("test-measure", "test-start", "test-end");
+
+  return promise.then(list => {
+    assert_equals(list.getEntries().length, 3,
+      "There should be three observed entries.");
+
+    var markEntries = list.getEntries().filter(entry => {
+      return entry.entryType == "mark";
+    });
+    assert_array_equals(markEntries, performance.getEntriesByType("mark"),
+      "Observed 'mark' entries should equal to entries obtained by getEntriesByType.");
+
+    var measureEntries = list.getEntries().filter(entry => {
+      return entry.entryType == "measure";
+    });
+    assert_array_equals(measureEntries, performance.getEntriesByType("measure"),
+      "Observed 'measure' entries should equal to entries obtained by getEntriesByType.");
+  });
+}, "Test for user-timing with PerformanceObserver");
+
+promise_test(t => {
+  var promise = new Promise((resolve, reject) => {
+    performance.clearMarks();
+    performance.clearMeasures();
+
+    var observer = new PerformanceObserver(list => reject(list));
+    observer.observe({entryTypes: ['mark', 'measure']});
+    observer.disconnect();
+    t.step_timeout(resolve, 100);
+  });
+
+  performance.mark("test-start");
+  performance.mark("test-end");
+  performance.measure("test-measure", "test-start", "test-end");
+
+  return promise.then(() => {
+    assert_equals(performance.getEntriesByType("mark").length, 2);
+    assert_equals(performance.getEntriesByType("measure").length, 1);
+  }, list => {
+    assert_unreached("Observer callback should never be called.");
+  });
+
+}, "Nothing should be notified after disconnecting observer");
+
+promise_test(t => {
+  var promise = promiseObserve(t, {entryTypes: ['mark']});
+
+  performance.mark("test");
+
+  return promise.then(list => {
+    assert_array_equals(list.getEntries({"entryType": "mark"}),
+                        performance.getEntriesByType("mark"),
+                        "getEntries with entryType filter should return correct results.");
+
+    assert_array_equals(list.getEntries({"name": "test"}),
+                        performance.getEntriesByName("test"),
+                        "getEntries with name filter should return correct results.");
+
+    assert_array_equals(list.getEntries({"name": "test",
+                                                      "entryType": "mark"}),
+                        performance.getEntriesByName("test"),
+                        "getEntries with name and entryType filter should return correct results.");
+
+    assert_array_equals(list.getEntries({"name": "invalid"}),
+                        [],
+                        "getEntries with non-existent name filter should return an empty array.");
+
+    assert_array_equals(list.getEntries({"name": "test",
+                                                      "entryType": "measure"}),
+                        [],
+                        "getEntries with name filter and non-existent entryType should return an empty array.");
+
+    assert_array_equals(list.getEntries({"name": "invalid",
+                                                      "entryType": "mark"}),
+                        [],
+                        "getEntries with non-existent name and entryType filter should return an empty array.");
+
+    assert_array_equals(list.getEntries({initiatorType: "xmlhttprequest"}),
+                        [],
+                        "getEntries with initiatorType filter should return an empty array.");
+  });
+}, "Test for PerformanceObserverEntryList.getEntries");
+
+promise_test(t => {
+  var promise = promiseObserve(t, {entryTypes: ['mark', 'measure']});
+
+  performance.mark("test");
+  performance.measure("test-measure", "test", "test");
+
+  return promise.then(list => {
+    assert_array_equals(list.getEntriesByType("mark"),
+                        performance.getEntriesByType("mark"));
+    assert_array_equals(list.getEntriesByType("measure"),
+                        performance.getEntriesByType("measure"));
+  });
+}, "Test for PerformanceObserverEntryList.getEntriesByType");
+
+promise_test(t => {
+  var promise = promiseObserve(t, {entryTypes: ['mark', 'measure']});
+
+  performance.mark("test");
+  performance.measure("test-measure", "test", "test");
+
+  return promise.then(list => {
+    assert_array_equals(list.getEntriesByName("test"),
+                        performance.getEntriesByName("test"));
+    assert_array_equals(list.getEntriesByName("test-measure"),
+                        performance.getEntriesByName("test-measure"));
+  });
+}, "Test for PerformanceObserverEntryList.getEntriesByName");
+
+promise_test(t => {
+  var promise = new Promise(resolve => {
+    performance.clearMarks();
+    performance.clearMeasures();
+
+    var observer = new PerformanceObserver(list => resolve(list));
+    observer.observe({entryTypes: ['mark', 'measure']});
+    observer.observe({entryTypes: ['mark', 'measure']});
+    t.add_cleanup(() => observer.disconnect());
+  });
+
+  performance.mark("test-start");
+  performance.mark("test-end");
+  performance.measure("test-measure", "test-start", "test-end");
+
+  return promise.then(list => {
+    assert_equals(list.getEntries().length, 3,
+                  "Observed user timing entries should have only three entries.");
+  });
+}, "Test that invoking observe method twice affects nothing");
+
+promise_test(t => {
+  var promise = new Promise(resolve => {
+    performance.clearMarks();
+    performance.clearMeasures();
+
+    var observer = new PerformanceObserver(list => resolve(list));
+    observer.observe({entryTypes: ['mark', 'measure']});
+    observer.observe({entryTypes: ['mark']});
+    t.add_cleanup(() => observer.disconnect());
+  });
+
+  performance.mark("test-start");
+  performance.mark("test-end");
+  performance.measure("test-measure", "test-start", "test-end");
+
+  return promise.then(list => {
+    assert_equals(list.getEntries().length, 2,
+                  "Observed user timing entries should have only two entries.");
+  });
+}, "Test that observing filter is replaced by a new filter");
+
+promise_test(t => {
+  var promise = new Promise(resolve => {
+    performance.clearMarks();
+    performance.clearMeasures();
+
+    var observer = new PerformanceObserver(list => resolve(list));
+    observer.observe({entryTypes: ['mark']});
+    observer.observe({entryTypes: ['measure']});
+    t.add_cleanup(() => observer.disconnect());
+  });
+
+  performance.mark("test-start");
+  performance.mark("test-end");
+  performance.measure("test-measure", "test-start", "test-end");
+
+  return promise.then(list => {
+    assert_equals(list.getEntries().length, 1,
+                  "Observed user timing entries should have only 1 entries.");
+  });
+}, "Test that observing filter is replaced by a new filter");
diff --git a/dom/performance/tests/test_performance_user_timing.html b/dom/performance/tests/test_performance_user_timing.html
new file mode 100644
index 000000000..5f4123eae
--- /dev/null
+++ b/dom/performance/tests/test_performance_user_timing.html
@@ -0,0 +1,45 @@
+<!DOCTYPE HTML>
+<html>
+    <!--
+              https://bugzilla.mozilla.org/show_bug.cgi?id=782751
+              -->
+    <head>
+        <title>Test for Bug 782751</title>
+        <meta http-equiv="content-type" content="text/html; charset=UTF-8">
+        <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+        <script type="text/javascript" src="test_performance_user_timing.js"></script>
+    </head>
+    <body>
+        <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=782751">Mozilla Bug 782751 - User Timing API</a>
+        <div id="content">
+        </div>
+        <pre id="test">
+            <script class="testbody" type="text/javascript">
+             var index = 0;
+
+             function next() {
+                 ok(true, "Begin!");
+                 var arr;
+                 for (var i = 0; i < steps.length; ++i) {
+                     try {
+                         performance.clearMarks();
+                         performance.clearMeasures();
+                         performance.clearResourceTimings();
+                         is(performance.getEntriesByType("resource").length, 0, "clearing performance resource entries");
+                         is(performance.getEntriesByType("mark").length, 0, "clearing performance mark entries");
+                         is(performance.getEntriesByType("measure").length, 0, "clearing performance measure entries");
+                         steps[i]();
+                     } catch(ex) {
+                         ok(false, "Caught exception", ex);
+                     }
+                 }
+
+                SimpleTest.finish();
+             }
+
+             SimpleTest.waitForExplicitFinish();
+             addLoadEvent(next);
+            </script>
+        </pre>
+    </body>
+</html>
diff --git a/dom/performance/tests/test_performance_user_timing.js b/dom/performance/tests/test_performance_user_timing.js
new file mode 100644
index 000000000..3d05ebb77
--- /dev/null
+++ b/dom/performance/tests/test_performance_user_timing.js
@@ -0,0 +1,272 @@
+var steps = [
+    // Test single mark addition
+    function () {
+        ok(true, "Running mark addition test");
+        performance.mark("test");
+        var marks = performance.getEntriesByType("mark");
+        is(marks.length, 1, "Number of marks should be 1");
+        var mark = marks[0];
+        is(mark.name, "test", "mark name should be 'test'");
+        is(mark.entryType, "mark", "mark type should be 'mark'");
+        isnot(mark.startTime, 0, "mark start time should not be 0");
+        is(mark.duration, 0, "mark duration should be 0");
+    },
+    // Test multiple mark addition
+    function () {
+        ok(true, "Running multiple mark with same name addition test");
+        performance.mark("test");
+        performance.mark("test");
+        performance.mark("test");
+        var marks_type = performance.getEntriesByType("mark");
+        is(marks_type.length, 3, "Number of marks by type should be 3");
+        var marks_name = performance.getEntriesByName("test");
+        is(marks_name.length, 3, "Number of marks by name should be 3");
+        var mark = marks_name[0];
+        is(mark.name, "test", "mark name should be 'test'");
+        is(mark.entryType, "mark", "mark type should be 'mark'");
+        isnot(mark.startTime, 0, "mark start time should not be 0");
+        is(mark.duration, 0, "mark duration should be 0");
+        var times = [];
+        // This also tests the chronological ordering specified as
+        // required for getEntries in the performance timeline spec.
+        marks_name.forEach(function(s) {
+            times.forEach(function(time) {
+                ok(s.startTime >= time.startTime,
+                   "Times should be equal or increasing between similarly named marks: " + s.startTime + " >= " + time.startTime);
+            });
+            times.push(s);
+        });
+    },
+    // Test all marks removal
+    function () {
+        ok(true, "Running all mark removal test");
+        performance.mark("test");
+        performance.mark("test2");
+        var marks = performance.getEntriesByType("mark");
+        is(marks.length, 2, "number of marks before all removal");
+        performance.clearMarks();
+        marks = performance.getEntriesByType("mark");
+        is(marks.length, 0, "number of marks after all removal");
+    },
+    // Test single mark removal
+    function () {
+        ok(true, "Running removal test (0 'test' marks with other marks)");
+        performance.mark("test2");
+        var marks = performance.getEntriesByType("mark");
+        is(marks.length, 1, "number of marks before all removal");
+        performance.clearMarks("test");
+        marks = performance.getEntriesByType("mark");
+        is(marks.length, 1, "number of marks after all removal");
+    },
+    // Test single mark removal
+    function () {
+        ok(true, "Running removal test (0 'test' marks with no other marks)");
+        var marks = performance.getEntriesByType("mark");
+        is(marks.length, 0, "number of marks before all removal");
+        performance.clearMarks("test");
+        marks = performance.getEntriesByType("mark");
+        is(marks.length, 0, "number of marks after all removal");
+    },
+    function () {
+        ok(true, "Running removal test (1 'test' mark with other marks)");
+        performance.mark("test");
+        performance.mark("test2");
+        var marks = performance.getEntriesByType("mark");
+        is(marks.length, 2, "number of marks before all removal");
+        performance.clearMarks("test");
+        marks = performance.getEntriesByType("mark");
+        is(marks.length, 1, "number of marks after all removal");
+    },
+    function () {
+        ok(true, "Running removal test (1 'test' mark with no other marks)");
+        performance.mark("test");
+        var marks = performance.getEntriesByType("mark");
+        is(marks.length, 1, "number of marks before all removal");
+        performance.clearMarks("test");
+        marks = performance.getEntriesByType("mark");
+        is(marks.length, 0, "number of marks after all removal");
+    },
+    function () {
+        ok(true, "Running removal test (2 'test' marks with other marks)");
+        performance.mark("test");
+        performance.mark("test");
+        performance.mark("test2");
+        var marks = performance.getEntriesByType("mark");
+        is(marks.length, 3, "number of marks before all removal");
+        performance.clearMarks("test");
+        marks = performance.getEntriesByType("mark");
+        is(marks.length, 1, "number of marks after all removal");
+    },
+    function () {
+        ok(true, "Running removal test (2 'test' marks with no other marks)");
+        performance.mark("test");
+        performance.mark("test");
+        var marks = performance.getEntriesByType("mark");
+        is(marks.length, 2, "number of marks before all removal");
+        performance.clearMarks("test");
+        marks = performance.getEntriesByType("mark");
+        is(marks.length, 0, "number of marks after all removal");
+    },
+    // Test mark name being same as navigation timing parameter
+    function () {
+        ok(true, "Running mark name collision test");
+        for (n in performance.timing) {
+            try {
+                if (n == "toJSON") {
+                    ok(true, "Skipping toJSON entry in collision test");
+                    continue;
+                }
+                performance.mark(n);
+                ok(false, "Mark name collision test failed for name " + n + ", shouldn't make it here!");
+            } catch (e) {
+                ok(e instanceof DOMException, "DOM exception thrown for mark named " + n);
+                is(e.code, e.SYNTAX_ERR, "DOM exception for name collision is syntax error");
+            }
+        };
+    },
+    // Test measure
+    function () {
+        ok(true, "Running measure addition with no start/end time test");
+        performance.measure("test");
+        var measures = performance.getEntriesByType("measure");
+        is(measures.length, 1, "number of measures should be 1");
+        var measure = measures[0];
+        is(measure.name, "test", "measure name should be 'test'");
+        is(measure.entryType, "measure", "measure type should be 'measure'");
+        is(measure.startTime, 0, "measure start time should be zero");
+        ok(measure.duration >= 0, "measure duration should not be negative");
+    },
+    function () {
+        ok(true, "Running measure addition with only start time test");
+        performance.mark("test1");
+        performance.measure("test", "test1", undefined);
+        var measures = performance.getEntriesByName("test", "measure");
+        var marks = performance.getEntriesByName("test1", "mark");
+        var measure = measures[0];
+        var mark = marks[0];
+        is(measure.startTime, mark.startTime, "measure start time should be equal to the mark startTime");
+        ok(measure.duration >= 0, "measure duration should not be negative");
+    },
+    function () {
+        ok(true, "Running measure addition with only end time test");
+        performance.mark("test1");
+        performance.measure("test", undefined, "test1");
+        var measures = performance.getEntriesByName("test", "measure");
+        var marks = performance.getEntriesByName("test1", "mark");
+        var measure = measures[0];
+        var mark = marks[0];
+        ok(measure.duration >= 0, "measure duration should not be negative");
+    },
+    // Test measure picking latest version of similarly named tags
+    function () {
+        ok(true, "Running multiple mark with same name addition test");
+        performance.mark("test");
+        performance.mark("test");
+        performance.mark("test");
+        performance.mark("test2");
+        var marks_name = performance.getEntriesByName("test");
+        is(marks_name.length, 3, "Number of marks by name should be 3");
+        var marks_name2 = performance.getEntriesByName("test2");
+        is(marks_name2.length, 1, "Number of marks by name should be 1");
+        var test_mark = marks_name2[0];
+        performance.measure("test", "test", "test2");
+        var measures_type = performance.getEntriesByType("measure");
+        var last_mark = marks_name[marks_name.length - 1];
+        is(measures_type.length, 1, "Number of measures by type should be 1");
+        var measure = measures_type[0];
+        is(measure.startTime, last_mark.startTime, "Measure start time should be the start time of the latest 'test' mark");
+        // Tolerance testing to avoid oranges, since we're doing double math across two different languages.
+        ok(measure.duration - (test_mark.startTime - last_mark.startTime) < .00001,
+           "Measure duration ( " + measure.duration + ") should be difference between two marks");
+    },
+    function() {
+        ok(true, "Running measure addition with no start/end time test");
+        performance.measure("test", "navigationStart");
+        var measures = performance.getEntriesByType("measure");
+        is(measures.length, 1, "number of measures should be 1");
+        var measure = measures[0];
+        is(measure.name, "test", "measure name should be 'test'");
+        is(measure.entryType, "measure", "measure type should be 'measure'");
+        is(measure.startTime, 0, "measure start time should be zero");
+        ok(measure.duration >= 0, "measure duration should not be negative");
+    },
+    // Test all measure removal
+    function () {
+        ok(true, "Running all measure removal test");
+        performance.measure("test");
+        performance.measure("test2");
+        var measures = performance.getEntriesByType("measure");
+        is(measures.length, 2, "measure entries should be length 2");
+        performance.clearMeasures();
+        measures = performance.getEntriesByType("measure");
+        is(measures.length, 0, "measure entries should be length 0");
+    },
+    // Test single measure removal
+    function () {
+        ok(true, "Running all measure removal test");
+        performance.measure("test");
+        performance.measure("test2");
+        var measures = performance.getEntriesByType("measure");
+        is(measures.length, 2, "measure entries should be length 2");
+        performance.clearMeasures("test");
+        measures = performance.getEntriesByType("measure");
+        is(measures.length, 1, "measure entries should be length 1");
+    },
+    // Test measure with invalid start time mark name
+    function () {
+        ok(true, "Running measure invalid start test");
+        try {
+            performance.measure("test", "notamark");
+            ok(false, "invalid measure start time exception not thrown!");
+        } catch (e) {
+            ok(e instanceof DOMException, "DOM exception thrown for invalid measure");
+            is(e.code, e.SYNTAX_ERR, "DOM exception for invalid time is syntax error");
+        }
+    },
+    // Test measure with invalid end time mark name
+    function () {
+        ok(true, "Running measure invalid end test");
+        try {
+            performance.measure("test", undefined, "notamark");
+            ok(false, "invalid measure end time exception not thrown!");
+        } catch (e) {
+            ok(e instanceof DOMException, "DOM exception thrown for invalid measure");
+            is(e.code, e.SYNTAX_ERR, "DOM exception for invalid time is syntax error");
+        }
+    },
+    // Test measure name being same as navigation timing parameter
+    function () {
+        ok(true, "Running measure name collision test");
+        for (n in performance.timing) {
+            try {
+                if (n == "toJSON") {
+                    ok(true, "Skipping toJSON entry in collision test");
+                    continue;
+                }
+                performance.measure(n);
+                ok(false, "Measure name collision test failed for name " + n + ", shouldn't make it here!");
+            } catch (e) {
+                ok(e instanceof DOMException, "DOM exception thrown for measure named " + n);
+                is(e.code, e.SYNTAX_ERR, "DOM exception for name collision is syntax error");
+            }
+        };
+    },
+    // Test measure mark being a reserved name
+    function () {
+        ok(true, "Create measures using all reserved names");
+        for (n in performance.timing) {
+            try {
+                if (n == "toJSON") {
+                    ok(true, "Skipping toJSON entry in collision test");
+                    continue;
+                }
+                performance.measure("test", n);
+                ok(true, "Measure created from reserved name as starting time: " + n);
+            } catch (e) {
+                ok(["redirectStart", "redirectEnd", "unloadEventStart", "unloadEventEnd", "loadEventEnd"].indexOf(n) >= 0,
+                   "Measure created from reserved name as starting time: " + n + " and threw expected error");
+            }
+        };
+    },
+    // TODO: Test measure picking latest version of similarly named tags
+];
diff --git a/dom/performance/tests/test_sharedWorker_performance_user_timing.html b/dom/performance/tests/test_sharedWorker_performance_user_timing.html
new file mode 100644
index 000000000..0498672f3
--- /dev/null
+++ b/dom/performance/tests/test_sharedWorker_performance_user_timing.html
@@ -0,0 +1,27 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+  <head>
+    <title>Test for worker performance timing API</title>
+    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
+    <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  </head>
+  <body>
+    <script class="testbody" type="text/javascript">
+
+var sw = new SharedWorker('sharedworker_performance_user_timing.js');
+sw.port.onmessage = function(event) {
+  if (event.data.type == 'finish') {
+    SimpleTest.finish();
+  } else if (event.data.type == 'status') {
+    ok(event.data.status, event.data.msg);
+  }
+}
+
+SimpleTest.waitForExplicitFinish();
+    </script>
+  </body>
+</html>
diff --git a/dom/performance/tests/test_worker_observer.html b/dom/performance/tests/test_worker_observer.html
new file mode 100644
index 000000000..b9ed0c964
--- /dev/null
+++ b/dom/performance/tests/test_worker_observer.html
@@ -0,0 +1,17 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test for performance observer in worker</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+<script>
+'use strict';
+SpecialPowers.pushPrefEnv({"set": [["dom.enable_performance_observer", true]]},
+                          function() {
+                            window.open("worker_performance_observer.html");
+                          });
+</script>
diff --git a/dom/performance/tests/test_worker_performance_now.html b/dom/performance/tests/test_worker_performance_now.html
new file mode 100644
index 000000000..ec84ccd10
--- /dev/null
+++ b/dom/performance/tests/test_worker_performance_now.html
@@ -0,0 +1,32 @@
+<!-- Any copyright is dedicated to the Public Domain.
+   - http://creativecommons.org/publicdomain/zero/1.0/ -->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Validate Interfaces Exposed to Workers</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+var worker = new Worker('test_worker_performance_now.js');
+worker.onmessage = function(event) {
+  if (event.data.type == 'finish') {
+    SimpleTest.finish();
+
+  } else if (event.data.type == 'status') {
+    ok(event.data.status, event.data.msg);
+
+  } else if (event.data.type == 'getOSCPU') {
+    worker.postMessage({
+      type: 'returnOSCPU',
+      result: navigator.oscpu
+    });
+  }
+}
+
+</script>
+</body>
+</html>
diff --git a/dom/performance/tests/test_worker_performance_now.js b/dom/performance/tests/test_worker_performance_now.js
new file mode 100644
index 000000000..c2a905031
--- /dev/null
+++ b/dom/performance/tests/test_worker_performance_now.js
@@ -0,0 +1,76 @@
+function ok(a, msg) {
+  dump("OK: " + !!a + "  =>  " + a + ": " + msg + "\n");
+  postMessage({type: 'status', status: !!a, msg: a + ": " + msg });
+}
+
+function workerTestDone() {
+  postMessage({ type: 'finish' });
+}
+
+function workerTestGetOSCPU(cb) {
+  addEventListener('message', function workerTestGetOSCPUCB(e) {
+    if (e.data.type !== 'returnOSCPU') {
+      return;
+    }
+    removeEventListener('message', workerTestGetOSCPUCB);
+    cb(e.data.result);
+  });
+  postMessage({
+    type: 'getOSCPU'
+  });
+}
+
+ok(self.performance, "Performance object should exist.");
+ok(typeof self.performance.now == 'function', "Performance object should have a 'now' method.");
+var n = self.performance.now(), d = Date.now();
+ok(n >= 0, "The value of now() should be equal to or greater than 0.");
+ok(self.performance.now() >= n, "The value of now() should monotonically increase.");
+
+// The spec says performance.now() should have micro-second resolution, but allows 1ms if the platform doesn't support it.
+// Our implementation does provide micro-second resolution, except for windows XP combined with some HW properties
+// where we can't use QueryPerformanceCounters (see comments at mozilla-central/xpcom/ds/TimeStamp_windows.cpp).
+// This XP-low-res case results in about 15ms resolutions, and can be identified when perf.now() returns only integers.
+//
+// Since setTimeout might return too early/late, our goal is that perf.now() changed within 2ms
+// (or 25ms for XP-low-res), rather than specific number of setTimeout(N) invocations.
+// See bug 749894 (intermittent failures of this test)
+var platformPossiblyLowRes;
+workerTestGetOSCPU(function(oscpu) {
+    platformPossiblyLowRes = oscpu.indexOf("Windows NT 5.1") == 0; // XP only
+    setTimeout(checkAfterTimeout, 1);
+});
+var allInts = (n % 1) == 0; // Indicator of limited HW resolution.
+var checks = 0;
+
+function checkAfterTimeout() {
+  checks++;
+  var d2 = Date.now();
+  var n2 = self.performance.now();
+
+  allInts = allInts && (n2 % 1) == 0;
+  var lowResCounter = platformPossiblyLowRes && allInts;
+
+  if ( n2 == n && checks < 50 && // 50 is just a failsafe. Our real goals are 2ms or 25ms.
+       ( (d2 - d) < 2 // The spec allows 1ms resolution. We allow up to measured 2ms to ellapse.
+         ||
+         lowResCounter &&
+         (d2 - d) < 25
+       )
+     ) {
+    setTimeout(checkAfterTimeout, 1);
+    return;
+  }
+
+  // Loose spec: 1ms resolution, or 15ms resolution for the XP-low-res case.
+  // We shouldn't test that dt is actually within 2/25ms since the iterations break if it isn't, and timeout could be late.
+  ok(n2 > n, "Loose - the value of now() should increase within 2ms (or 25ms if low-res counter) (delta now(): " + (n2 - n) + " ms).");
+
+  // Strict spec: if it's not the XP-low-res case, while the spec allows 1ms resolution, it prefers microseconds, which we provide.
+  // Since the fastest setTimeout return which I observed was ~500 microseconds, a microseconds counter should change in 1 iteretion.
+  ok(n2 > n && (lowResCounter || checks == 1),
+     "Strict - [if high-res counter] the value of now() should increase after one setTimeout (hi-res: " + (!lowResCounter) +
+                                                                                              ", iters: " + checks +
+                                                                                              ", dt: " + (d2 - d) +
+                                                                                              ", now(): " + n2 + ").");
+  workerTestDone();
+};
diff --git a/dom/performance/tests/test_worker_user_timing.html b/dom/performance/tests/test_worker_user_timing.html
new file mode 100644
index 000000000..2bf465cbd
--- /dev/null
+++ b/dom/performance/tests/test_worker_user_timing.html
@@ -0,0 +1,27 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+  <head>
+    <title>Test for worker performance timing API</title>
+    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
+    <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  </head>
+  <body>
+    <script class="testbody" type="text/javascript">
+
+var worker = new Worker('worker_performance_user_timing.js');
+worker.onmessage = function(event) {
+  if (event.data.type == 'finish') {
+    SimpleTest.finish();
+  } else if (event.data.type == 'status') {
+    ok(event.data.status, event.data.msg);
+  }
+}
+
+SimpleTest.waitForExplicitFinish();
+    </script>
+  </body>
+</html>
diff --git a/dom/performance/tests/worker_performance_observer.html b/dom/performance/tests/worker_performance_observer.html
new file mode 100644
index 000000000..613762f52
--- /dev/null
+++ b/dom/performance/tests/worker_performance_observer.html
@@ -0,0 +1,32 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE html>
+<meta charset=utf-8>
+<html>
+<head>
+<title>Test for performance observer in worker</title>
+</head>
+<body>
+<div id="log"></div>
+<script>
+[
+ "async_test", "test", "setup",
+ "assert_true", "assert_equals", "assert_array_equals",
+ "assert_throws", "fetch_tests_from_worker"
+].forEach(func => {
+  window[func] = opener[func].bind(opener);
+});
+
+function done() {
+  opener.add_completion_callback(() => {
+    self.close();
+  });
+  opener.done();
+}
+
+fetch_tests_from_worker(new Worker("worker_performance_observer.js"));
+done();
+</script>
+</body>
diff --git a/dom/performance/tests/worker_performance_observer.js b/dom/performance/tests/worker_performance_observer.js
new file mode 100644
index 000000000..8faf66f67
--- /dev/null
+++ b/dom/performance/tests/worker_performance_observer.js
@@ -0,0 +1,4 @@
+importScripts(['/resources/testharness.js']);
+importScripts(['test_performance_observer.js']);
+
+done();
diff --git a/dom/performance/tests/worker_performance_user_timing.js b/dom/performance/tests/worker_performance_user_timing.js
new file mode 100644
index 000000000..fa2f1afab
--- /dev/null
+++ b/dom/performance/tests/worker_performance_user_timing.js
@@ -0,0 +1,24 @@
+function ok(a, msg) {
+  dump("OK: " + !!a + "  =>  " + a + " " + msg + "\n");
+  postMessage({type: 'status', status: !!a, msg: a + ": " + msg });
+}
+
+function is(a, b, msg) {
+  dump("IS: " + (a===b) + "  =>  " + a + " | " + b + " " + msg + "\n");
+  postMessage({type: 'status', status: a === b, msg: a + " === " + b + ": " + msg });
+}
+
+function isnot(a, b, msg) {
+  dump("ISNOT: " + (a===b) + "  =>  " + a + " | " + b + " " + msg + "\n");
+  postMessage({type: 'status', status: a != b, msg: a + " != " + b + ": " + msg });
+}
+
+importScripts(['test_performance_user_timing.js']);
+
+for (var i = 0; i < steps.length; ++i) {
+  performance.clearMarks();
+  performance.clearMeasures();
+  steps[i]();
+}
+
+postMessage({type: 'finish'});