Merge branch 'ported-upstream'

53 files changed, 570 insertions, 507 deletions

diff --git a/dom/base/File.cpp b/dom/base/File.cpp
index 46b37b976..8602a3064 100644..100755
--- a/dom/base/File.cpp
+++ b/dom/base/File.cpp
@@ -29,6 +29,7 @@
 #include "nsStringStream.h"
 #include "nsJSUtils.h"
 #include "nsPrintfCString.h"
+#include "mozilla/TimerClamping.h"
 #include "mozilla/SHA1.h"
 #include "mozilla/CheckedInt.h"
 #include "mozilla/Preferences.h"
@@ -727,7 +728,7 @@ BlobImplBase::GetLastModified(ErrorResult& aRv)
     mLastModificationDate = PR_Now();
   }
 
-  return mLastModificationDate / PR_USEC_PER_MSEC;
+  return TimerClamping::ReduceUsTimeValue(mLastModificationDate) / PR_USEC_PER_MSEC;
 }
 
 void
diff --git a/dom/base/MultipartBlobImpl.cpp b/dom/base/MultipartBlobImpl.cpp
index ba26d07f9..03bb62add 100644..100755
--- a/dom/base/MultipartBlobImpl.cpp
+++ b/dom/base/MultipartBlobImpl.cpp
@@ -17,6 +17,7 @@
 #include "nsContentUtils.h"
 #include "nsIScriptError.h"
 #include "nsIXPConnect.h"
+#include "mozilla/TimerClamping.h"
 #include <algorithm>
 
 using namespace mozilla;
@@ -270,8 +271,7 @@ MultipartBlobImpl::SetLengthAndModifiedDate(ErrorResult& aRv)
     //   var x = new Date(); var f = new File(...);
     //   x.getTime() < f.dateModified.getTime()
     // could fail.
-    mLastModificationDate =
-      lastModifiedSet ? lastModified * PR_USEC_PER_MSEC : JS_Now();
+    mLastModificationDate = TimerClamping::ReduceUsTimeValue(lastModifiedSet ? lastModified * PR_USEC_PER_MSEC : JS_Now());
   }
 }
 
diff --git a/dom/base/TimerClamping.cpp b/dom/base/TimerClamping.cpp
new file mode 100755
index 000000000..70639686b
--- /dev/null
+++ b/dom/base/TimerClamping.cpp
@@ -0,0 +1,35 @@
+/* -*- 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 "TimerClamping.h"
+
+namespace mozilla {
+
+/* static */
+double
+TimerClamping::ReduceSTimeValue(double aTime)
+{
+  static const double maxResolutionS = .002;
+  return floor(aTime / maxResolutionS) * maxResolutionS;
+}
+
+/* static */
+double
+TimerClamping::ReduceMsTimeValue(double aTime)
+{
+  static const double maxResolutionMs = 2;
+  return floor(aTime / maxResolutionMs) * maxResolutionMs;
+}
+
+/* static */
+double
+TimerClamping::ReduceUsTimeValue(double aTime)
+{
+  static const double maxResolutionUs = 2000;
+  return floor(aTime / maxResolutionUs) * maxResolutionUs;
+}
+
+}
\ No newline at end of file
diff --git a/dom/base/TimerClamping.h b/dom/base/TimerClamping.h
new file mode 100755
index 000000000..2ffd6add5
--- /dev/null
+++ b/dom/base/TimerClamping.h
@@ -0,0 +1,22 @@
+/* -*- 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 TimerClamping_h___
+#define TimerClamping_h___
+
+namespace mozilla {
+
+class TimerClamping
+{
+public:
+  static double ReduceSTimeValue(double aTime);
+  static double ReduceMsTimeValue(double aTime);
+  static double ReduceUsTimeValue(double aTime);
+};
+
+}
+
+#endif /* TimerClamping_h___ */
\ No newline at end of file
diff --git a/dom/base/moz.build b/dom/base/moz.build
index 686d76e73..0fb345d22 100644..100755
--- a/dom/base/moz.build
+++ b/dom/base/moz.build
@@ -143,6 +143,7 @@ EXPORTS.mozilla += [
     'CORSMode.h',
     'FeedWriterEnabled.h',
     'TextInputProcessor.h',
+    'TimerClamping.h',
     'UseCounter.h',
 ]
 
@@ -363,6 +364,7 @@ UNIFIED_SOURCES += [
     'TextInputProcessor.cpp',
     'ThirdPartyUtil.cpp',
     'Timeout.cpp',
+    'TimerClamping.cpp',
     'TreeWalker.cpp',
     'WebKitCSSMatrix.cpp',
     'WebSocket.cpp',
diff --git a/dom/base/nsDocumentEncoder.cpp b/dom/base/nsDocumentEncoder.cpp
index 0a3570962..84b128b15 100644
--- a/dom/base/nsDocumentEncoder.cpp
+++ b/dom/base/nsDocumentEncoder.cpp
@@ -481,7 +481,7 @@ nsDocumentEncoder::SerializeToStringRecursive(nsINode* aNode,
   }
 
   if (!aDontSerializeRoot) {
-    rv = SerializeNodeEnd(node, aStr);
+    rv = SerializeNodeEnd(maybeFixedNode, aStr);
     NS_ENSURE_SUCCESS(rv, rv);
   }
 
diff --git a/dom/base/nsXHTMLContentSerializer.cpp b/dom/base/nsXHTMLContentSerializer.cpp
index 0dc31d7ae..111ed46c7 100644..100755
--- a/dom/base/nsXHTMLContentSerializer.cpp
+++ b/dom/base/nsXHTMLContentSerializer.cpp
@@ -306,7 +306,7 @@ nsXHTMLContentSerializer::SerializeAttributes(nsIContent* aContent,
         continue;
     }
 
-    BorrowedAttrInfo info = aContent->GetAttrInfoAt(index);
+    mozilla::dom::BorrowedAttrInfo info = aContent->GetAttrInfoAt(index);
     const nsAttrName* name = info.mName;
 
     int32_t namespaceID = name->NamespaceID();
diff --git a/dom/base/test/test_bug403852.html b/dom/base/test/test_bug403852.html
index 30192cb1b..592711500 100644
--- a/dom/base/test/test_bug403852.html
+++ b/dom/base/test/test_bug403852.html
@@ -38,7 +38,8 @@ function onOpened(message) {
   ok("lastModifiedDate" in domFile, "lastModifiedDate must be present");
 
   var d = new Date(message.mtime);
-  is(d.getTime(), domFile.lastModifiedDate.getTime(), "lastModifiedDate should be the same");
+  // Commented out: lastModifiedDate is rounded because it is a DOM API, message is a special-powers Chrome thing
+  // is(d.getTime(), domFile.lastModifiedDate.getTime(), "lastModifiedDate should be the same");
 
   var x = new Date();
 
@@ -53,8 +54,8 @@ function onOpened(message) {
   ok((x.getTime() <= y.getTime()) && (y.getTime() <= z.getTime()), "lastModifiedDate of file which does not have last modified date should be current time");
 
 
-  var d = new Date(message.fileDate);
-  is(d.getTime(), message.fileWithDate.lastModifiedDate.getTime(), "lastModifiedDate should be the same when lastModified is set: " + message.fileWithDate.lastModified);
+  // var d = new Date(message.fileDate);
+  // is(d.getTime(), message.fileWithDate.lastModifiedDate.getTime(), "lastModifiedDate should be the same when lastModified is set: " + message.fileWithDate.lastModified);
 
   script.destroy();
   SimpleTest.finish();
diff --git a/dom/base/test/test_file_negative_date.html b/dom/base/test/test_file_negative_date.html
index ebfa9bd0d..26cf3b82e 100644
--- a/dom/base/test/test_file_negative_date.html
+++ b/dom/base/test/test_file_negative_date.html
@@ -22,13 +22,13 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=1158437
 
 var blob = new Blob(['hello world']);
 var f1 = new File([blob], 'f1.txt', { lastModified: 0 });
-var f2 = new File([blob], 'f2.txt', { lastModified: -1 });
+var f2 = new File([blob], 'f2.txt', { lastModified: -2 });
 var f3 = new File([blob], 'f3.txt', { lastModified: -1000 });
 
 is(f1.lastModified, 0, "lastModified == 0 is supported");
 ok(f1.lastModifiedDate.toString(), (new Date(0)).toString(), "Correct f1.lastModifiedDate value");
-is(f2.lastModified, -1, "lastModified == -1 is supported");
-ok(f2.lastModifiedDate.toString(), (new Date(-1)).toString(), "Correct f2.lastModifiedDate value");
+is(f2.lastModified, -2, "lastModified == -2 is supported");
+ok(f2.lastModifiedDate.toString(), (new Date(-2)).toString(), "Correct f2.lastModifiedDate value");
 is(f3.lastModified, -1000, "lastModified == -1000 is supported");
 ok(f3.lastModifiedDate.toString(), (new Date(-1000)).toString(), "Correct f3.lastModifiedDate value");
 
diff --git a/dom/canvas/CanvasRenderingContext2D.cpp b/dom/canvas/CanvasRenderingContext2D.cpp
index 35ea2cd1a..15df2b337 100644
--- a/dom/canvas/CanvasRenderingContext2D.cpp
+++ b/dom/canvas/CanvasRenderingContext2D.cpp
@@ -92,8 +92,6 @@
 #include "mozilla/gfx/PathHelpers.h"
 #include "mozilla/gfx/DataSurfaceHelpers.h"
 #include "mozilla/gfx/PatternHelpers.h"
-#include "mozilla/ipc/DocumentRendererParent.h"
-#include "mozilla/ipc/PDocumentRendererParent.h"
 #include "mozilla/layers/PersistentBufferProvider.h"
 #include "mozilla/MathAlgorithms.h"
 #include "mozilla/Preferences.h"
diff --git a/dom/canvas/DocumentRendererChild.cpp b/dom/canvas/DocumentRendererChild.cpp
deleted file mode 100644
index 15dd5fc52..000000000
--- a/dom/canvas/DocumentRendererChild.cpp
+++ /dev/null
@@ -1,94 +0,0 @@
-/* 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 "mozilla/ipc/DocumentRendererChild.h"
-
-#include "base/basictypes.h"
-
-#include "gfx2DGlue.h"
-#include "gfxPattern.h"
-#include "mozilla/gfx/2D.h"
-#include "mozilla/RefPtr.h"
-#include "nsPIDOMWindow.h"
-#include "nsIDOMWindow.h"
-#include "nsIDocShell.h"
-#include "nsIInterfaceRequestorUtils.h"
-#include "nsComponentManagerUtils.h"
-#include "nsCSSParser.h"
-#include "nsPresContext.h"
-#include "nsCOMPtr.h"
-#include "nsColor.h"
-#include "gfxContext.h"
-#include "nsLayoutUtils.h"
-#include "nsContentUtils.h"
-#include "nsCSSValue.h"
-#include "nsRuleNode.h"
-#include "mozilla/gfx/Matrix.h"
-
-using namespace mozilla;
-using namespace mozilla::gfx;
-using namespace mozilla::ipc;
-
-DocumentRendererChild::DocumentRendererChild()
-{}
-
-DocumentRendererChild::~DocumentRendererChild()
-{}
-
-bool
-DocumentRendererChild::RenderDocument(nsPIDOMWindowOuter* window,
-                                      const nsRect& documentRect,
-                                      const mozilla::gfx::Matrix& transform,
-                                      const nsString& aBGColor,
-                                      uint32_t renderFlags,
-                                      bool flushLayout,
-                                      const nsIntSize& renderSize,
-                                      nsCString& data)
-{
-    if (flushLayout)
-        nsContentUtils::FlushLayoutForTree(window);
-
-    RefPtr<nsPresContext> presContext;
-    if (window) {
-        nsIDocShell* docshell = window->GetDocShell();
-        if (docshell) {
-            docshell->GetPresContext(getter_AddRefs(presContext));
-        }
-    }
-    if (!presContext)
-        return false;
-
-    nsCSSParser parser;
-    nsCSSValue bgColorValue;
-    if (!parser.ParseColorString(aBGColor, nullptr, 0, bgColorValue)) {
-        return false;
-    }
-
-    nscolor bgColor;
-    if (!nsRuleNode::ComputeColor(bgColorValue, presContext, nullptr, bgColor)) {
-        return false;
-    }
-
-    // Draw directly into the output array.
-    data.SetLength(renderSize.width * renderSize.height * 4);
-
-    RefPtr<DrawTarget> dt =
-        Factory::CreateDrawTargetForData(BackendType::CAIRO,
-                                         reinterpret_cast<uint8_t*>(data.BeginWriting()),
-                                         IntSize(renderSize.width, renderSize.height),
-                                         4 * renderSize.width,
-                                         SurfaceFormat::B8G8R8A8);
-    if (!dt || !dt->IsValid()) {
-        gfxWarning() << "DocumentRendererChild::RenderDocument failed to Factory::CreateDrawTargetForData";
-        return false;
-    }
-    RefPtr<gfxContext> ctx = gfxContext::CreateOrNull(dt);
-    MOZ_ASSERT(ctx); // already checked the draw target above
-    ctx->SetMatrix(mozilla::gfx::ThebesMatrix(transform));
-
-    nsCOMPtr<nsIPresShell> shell = presContext->PresShell();
-    shell->RenderDocument(documentRect, renderFlags, bgColor, ctx);
-
-    return true;
-}
diff --git a/dom/canvas/DocumentRendererChild.h b/dom/canvas/DocumentRendererChild.h
deleted file mode 100644
index 463ba2707..000000000
--- a/dom/canvas/DocumentRendererChild.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/* 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_DocumentRendererChild
-#define mozilla_dom_DocumentRendererChild
-
-#include "mozilla/ipc/PDocumentRendererChild.h"
-#include "nsString.h"
-#include "gfxContext.h"
-
-class nsIDOMWindow;
-
-namespace mozilla {
-namespace ipc {
-
-class DocumentRendererChild : public PDocumentRendererChild
-{
-public:
-    DocumentRendererChild();
-    virtual ~DocumentRendererChild();
-
-    bool RenderDocument(nsPIDOMWindowOuter* window,
-                        const nsRect& documentRect, const gfx::Matrix& transform,
-                        const nsString& bgcolor,
-                        uint32_t renderFlags, bool flushLayout,
-                        const nsIntSize& renderSize, nsCString& data);
-
-private:
-
-    DISALLOW_EVIL_CONSTRUCTORS(DocumentRendererChild);
-};
-
-} // namespace ipc
-} // namespace mozilla
-
-#endif
diff --git a/dom/canvas/DocumentRendererParent.cpp b/dom/canvas/DocumentRendererParent.cpp
deleted file mode 100644
index d9578ac4e..000000000
--- a/dom/canvas/DocumentRendererParent.cpp
+++ /dev/null
@@ -1,63 +0,0 @@
-/* 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 "mozilla/ipc/DocumentRendererParent.h"
-
-#include "gfx2DGlue.h"
-#include "mozilla/gfx/2D.h"
-#include "mozilla/gfx/PathHelpers.h"
-#include "mozilla/RefPtr.h"
-#include "nsICanvasRenderingContextInternal.h"
-
-using namespace mozilla;
-using namespace mozilla::gfx;
-using namespace mozilla::ipc;
-
-DocumentRendererParent::DocumentRendererParent()
-{}
-
-DocumentRendererParent::~DocumentRendererParent()
-{}
-
-void DocumentRendererParent::SetCanvasContext(nsICanvasRenderingContextInternal* aCanvas,
-                                              gfxContext* ctx)
-{
-    mCanvas = aCanvas;
-    mCanvasContext = ctx;
-}
-
-void DocumentRendererParent::DrawToCanvas(const nsIntSize& aSize,
-                                          const nsCString& aData)
-{
-    if (!mCanvas || !mCanvasContext)
-        return;
-
-    DrawTarget* drawTarget = mCanvasContext->GetDrawTarget();
-    Rect rect(0, 0, aSize.width, aSize.height);
-    MaybeSnapToDevicePixels(rect, *drawTarget, true);
-    RefPtr<DataSourceSurface> dataSurface =
-        Factory::CreateWrappingDataSourceSurface(reinterpret_cast<uint8_t*>(const_cast<nsCString&>(aData).BeginWriting()),
-                                                 aSize.width * 4,
-                                                 IntSize(aSize.width, aSize.height),
-                                                 SurfaceFormat::B8G8R8A8);
-    SurfacePattern pattern(dataSurface, ExtendMode::CLAMP);
-    drawTarget->FillRect(rect, pattern);
-
-    gfxRect damageRect = mCanvasContext->UserToDevice(ThebesRect(rect));
-    mCanvas->Redraw(damageRect);
-}
-
-void
-DocumentRendererParent::ActorDestroy(ActorDestroyReason aWhy)
-{
-  // Implement me! Bug 1005139
-}
-
-bool
-DocumentRendererParent::Recv__delete__(const nsIntSize& renderedSize,
-                                       const nsCString& data)
-{
-    DrawToCanvas(renderedSize, data);
-    return true;
-}
diff --git a/dom/canvas/DocumentRendererParent.h b/dom/canvas/DocumentRendererParent.h
deleted file mode 100644
index 432aa8264..000000000
--- a/dom/canvas/DocumentRendererParent.h
+++ /dev/null
@@ -1,44 +0,0 @@
-/* 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_DocumentRendererParent
-#define mozilla_dom_DocumentRendererParent
-
-#include "mozilla/ipc/PDocumentRendererParent.h"
-#include "nsCOMPtr.h"
-#include "nsString.h"
-#include "gfxContext.h"
-
-class nsICanvasRenderingContextInternal;
-
-namespace mozilla {
-namespace ipc {
-
-class DocumentRendererParent : public PDocumentRendererParent
-{
-public:
-    DocumentRendererParent();
-    virtual ~DocumentRendererParent();
-
-    void SetCanvasContext(nsICanvasRenderingContextInternal* aCanvas,
-			  gfxContext* ctx);
-    void DrawToCanvas(const nsIntSize& renderedSize,
-		      const nsCString& aData);
-
-    virtual void ActorDestroy(ActorDestroyReason aWhy) override;
-
-    virtual bool Recv__delete__(const nsIntSize& renderedSize,
-                                const nsCString& data) override;
-
-private:
-    nsCOMPtr<nsICanvasRenderingContextInternal> mCanvas;
-    RefPtr<gfxContext> mCanvasContext;
-
-    DISALLOW_EVIL_CONSTRUCTORS(DocumentRendererParent);
-};
-
-} // namespace ipc
-} // namespace mozilla
-
-#endif
diff --git a/dom/canvas/WebGL2ContextState.cpp b/dom/canvas/WebGL2ContextState.cpp
index be0a7a3cb..e6283b12d 100644
--- a/dom/canvas/WebGL2ContextState.cpp
+++ b/dom/canvas/WebGL2ContextState.cpp
@@ -7,6 +7,7 @@
 #include "WebGL2Context.h"
 
 #include "GLContext.h"
+#include "GLScreenBuffer.h"
 #include "WebGLBuffer.h"
 #include "WebGLContextUtils.h"
 #include "WebGLFramebuffer.h"
diff --git a/dom/canvas/WebGLContextDraw.cpp b/dom/canvas/WebGLContextDraw.cpp
index 66fca7689..867e47cbd 100644
--- a/dom/canvas/WebGLContextDraw.cpp
+++ b/dom/canvas/WebGLContextDraw.cpp
@@ -16,6 +16,7 @@
 #include "WebGLRenderbuffer.h"
 #include "WebGLShader.h"
 #include "WebGLTexture.h"
+#include "WebGLTransformFeedback.h"
 #include "WebGLVertexArray.h"
 #include "WebGLVertexAttribData.h"
 
diff --git a/dom/canvas/WebGLContextExtensions.cpp b/dom/canvas/WebGLContextExtensions.cpp
index 28ba14fa2..4a5a23274 100644
--- a/dom/canvas/WebGLContextExtensions.cpp
+++ b/dom/canvas/WebGLContextExtensions.cpp
@@ -89,6 +89,8 @@ bool WebGLContext::IsExtensionSupported(dom::CallerType callerType,
 
     if (allowPrivilegedExts) {
         switch (ext) {
+        case WebGLExtensionID::EXT_disjoint_timer_query:
+            return WebGLExtensionDisjointTimerQuery::IsSupported(this);
         case WebGLExtensionID::WEBGL_debug_renderer_info:
             return true;
         case WebGLExtensionID::WEBGL_debug_shaders:
@@ -112,8 +114,6 @@ WebGLContext::IsExtensionSupported(WebGLExtensionID ext) const
     switch (ext) {
     // In alphabetical order
     // EXT_
-    case WebGLExtensionID::EXT_disjoint_timer_query:
-        return WebGLExtensionDisjointTimerQuery::IsSupported(this);
     case WebGLExtensionID::EXT_texture_filter_anisotropic:
         return gl->IsExtensionSupported(gl::GLContext::EXT_texture_filter_anisotropic);
 
diff --git a/dom/canvas/WebGLFramebuffer.cpp b/dom/canvas/WebGLFramebuffer.cpp
index 35efa4f16..0abaf3dd7 100644
--- a/dom/canvas/WebGLFramebuffer.cpp
+++ b/dom/canvas/WebGLFramebuffer.cpp
@@ -17,7 +17,9 @@
 #include "WebGLContextUtils.h"
 #include "WebGLExtensions.h"
 #include "WebGLRenderbuffer.h"
+#include "WebGLShader.h"
 #include "WebGLTexture.h"
+#include "WebGLObjectModel.h"
 
 namespace mozilla {
 
@@ -1940,6 +1942,7 @@ ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& callback,
     }
 }
 
+
 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(WebGLFramebuffer,
                                       mDepthAttachment,
                                       mStencilAttachment,
diff --git a/dom/canvas/WebGLObjectModel.h b/dom/canvas/WebGLObjectModel.h
index e19d2fd8e..b18b790c0 100644
--- a/dom/canvas/WebGLObjectModel.h
+++ b/dom/canvas/WebGLObjectModel.h
@@ -15,6 +15,7 @@ namespace mozilla {
 template<typename> class LinkedList;
 class WebGLContext;
 
+
 ////
 
 // This class is a mixin for objects that are tied to a specific
@@ -355,6 +356,16 @@ ImplCycleCollectionUnlink(mozilla::WebGLRefPtr<T>& field)
 template <typename T>
 inline void
 ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& callback,
+                            mozilla::WebGLRefPtr<T>& field,
+                            const char* name,
+                            uint32_t flags = 0)
+{
+    CycleCollectionNoteChild(callback, field.get(), name, flags);
+}
+
+template <typename T>
+inline void
+ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& callback,
                             const mozilla::WebGLRefPtr<T>& field,
                             const char* name,
                             uint32_t flags = 0)
@@ -362,4 +373,5 @@ ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& callback,
     CycleCollectionNoteChild(callback, field.get(), name, flags);
 }
 
+
 #endif
diff --git a/dom/canvas/WebGLProgram.cpp b/dom/canvas/WebGLProgram.cpp
index fa7997f22..9b204358b 100644
--- a/dom/canvas/WebGLProgram.cpp
+++ b/dom/canvas/WebGLProgram.cpp
@@ -17,6 +17,7 @@
 #include "WebGLTransformFeedback.h"
 #include "WebGLUniformLocation.h"
 #include "WebGLValidateStrings.h"
+#include "WebGLObjectModel.h"
 
 namespace mozilla {
 
diff --git a/dom/canvas/WebGLTransformFeedback.cpp b/dom/canvas/WebGLTransformFeedback.cpp
index feec581ea..78e366531 100644
--- a/dom/canvas/WebGLTransformFeedback.cpp
+++ b/dom/canvas/WebGLTransformFeedback.cpp
@@ -8,6 +8,7 @@
 #include "GLContext.h"
 #include "mozilla/dom/WebGL2RenderingContextBinding.h"
 #include "WebGL2Context.h"
+#include "WebGLProgram.h"
 
 namespace mozilla {
 
diff --git a/dom/canvas/moz.build b/dom/canvas/moz.build
index 55153c70b..f7555b33d 100644
--- a/dom/canvas/moz.build
+++ b/dom/canvas/moz.build
@@ -25,11 +25,6 @@ EXPORTS += [
     'nsICanvasRenderingContextInternal.h',
 ]
 
-EXPORTS.mozilla.ipc += [
-    'DocumentRendererChild.h',
-    'DocumentRendererParent.h',
-]
-
 EXPORTS.mozilla.dom += [
     'CanvasGradient.h',
     'CanvasPath.h',
@@ -52,8 +47,6 @@ UNIFIED_SOURCES += [
     'CanvasRenderingContext2D.cpp',
     'CanvasRenderingContextHelper.cpp',
     'CanvasUtils.cpp',
-    'DocumentRendererChild.cpp',
-    'DocumentRendererParent.cpp',
     'ImageBitmap.cpp',
     'ImageBitmapColorUtils.cpp',
     'ImageBitmapRenderingContext.cpp',
diff --git a/dom/canvas/test/webgl-mochitest/mochitest.ini b/dom/canvas/test/webgl-mochitest/mochitest.ini
index d5bc8701d..ddd0dd762 100644
--- a/dom/canvas/test/webgl-mochitest/mochitest.ini
+++ b/dom/canvas/test/webgl-mochitest/mochitest.ini
@@ -14,7 +14,7 @@ fail-if = (os == 'android')
 [ensure-exts/test_EXT_color_buffer_half_float.html]
 fail-if = (os == 'android')
 [ensure-exts/test_EXT_disjoint_timer_query.html]
-fail-if = (os == 'android') || (os == 'mac') || (os == 'win' && os_version == '5.1')
+fail-if = 1
 [ensure-exts/test_EXT_frag_depth.html]
 fail-if = (os == 'android')
 [ensure-exts/test_EXT_sRGB.html]
diff --git a/dom/console/Console.cpp b/dom/console/Console.cpp
index 9ede26501..79e3eadc5 100644..100755
--- a/dom/console/Console.cpp
+++ b/dom/console/Console.cpp
@@ -30,6 +30,7 @@
 #include "nsContentUtils.h"
 #include "nsDocShell.h"
 #include "nsProxyRelease.h"
+#include "mozilla/TimerClamping.h"
 #include "mozilla/ConsoleTimelineMarker.h"
 #include "mozilla/TimestampTimelineMarker.h"
 
@@ -1338,7 +1339,7 @@ Console::MethodInternal(JSContext* aCx, MethodName aMethodName,
       TimeDuration duration =
         mozilla::TimeStamp::Now() - workerPrivate->NowBaseTimeStamp();
 
-      monotonicTimer = duration.ToMilliseconds();
+      monotonicTimer = TimerClamping::ReduceMsTimeValue(duration.ToMilliseconds());
     }
   }
 
diff --git a/dom/events/Event.cpp b/dom/events/Event.cpp
index a85a0d66b..2af34136e 100644..100755
--- a/dom/events/Event.cpp
+++ b/dom/events/Event.cpp
@@ -32,6 +32,7 @@
 #include "nsJSEnvironment.h"
 #include "nsLayoutUtils.h"
 #include "nsPIWindowRoot.h"
+#include "mozilla/TimerClamping.h"
 #include "WorkerPrivate.h"
 
 namespace mozilla {
@@ -1085,6 +1086,12 @@ Event::DefaultPrevented(JSContext* aCx) const
 double
 Event::TimeStamp() const
 {
+  return TimerClamping::ReduceMsTimeValue(TimeStampImpl());
+}
+
+double
+Event::TimeStampImpl() const
+{
   if (!sReturnHighResTimeStamp) {
     return static_cast<double>(mEvent->mTime);
   }
diff --git a/dom/events/Event.h b/dom/events/Event.h
index 4ac6a68d5..c28226e8a 100644..100755
--- a/dom/events/Event.h
+++ b/dom/events/Event.h
@@ -62,6 +62,7 @@ private:
   void ConstructorInit(EventTarget* aOwner,
                        nsPresContext* aPresContext,
                        WidgetEvent* aEvent);
+  double TimeStampImpl() const;
 
 public:
   static Event* FromSupports(nsISupports* aSupports)
diff --git a/dom/events/EventStateManager.cpp b/dom/events/EventStateManager.cpp
index 659629066..c23cdb575 100644
--- a/dom/events/EventStateManager.cpp
+++ b/dom/events/EventStateManager.cpp
@@ -4151,9 +4151,10 @@ EventStateManager::NotifyMouseOver(WidgetMouseEvent* aMouseEvent,
   // content associated with our subdocument.
   EnsureDocument(mPresContext);
   if (nsIDocument *parentDoc = mDocument->GetParentDocument()) {
-    if (nsIContent *docContent = parentDoc->FindContentForSubDocument(mDocument)) {
+    if (nsCOMPtr<nsIContent> docContent =
+          parentDoc->FindContentForSubDocument(mDocument)) {
       if (nsIPresShell *parentShell = parentDoc->GetShell()) {
-        EventStateManager* parentESM =
+        RefPtr<EventStateManager> parentESM =
           parentShell->GetPresContext()->EventStateManager();
         parentESM->NotifyMouseOver(aMouseEvent, docContent);
       }
diff --git a/dom/events/test/test_eventTimeStamp.html b/dom/events/test/test_eventTimeStamp.html
index a3d096432..107a21f87 100644
--- a/dom/events/test/test_eventTimeStamp.html
+++ b/dom/events/test/test_eventTimeStamp.html
@@ -60,8 +60,8 @@ function testRegularEvents() {
   var timeBeforeEvent = window.performance.now();
   window.addEventListener("load", function(evt) {
     var timeAfterEvent = window.performance.now();
-    ok(evt.timeStamp > timeBeforeEvent &&
-       evt.timeStamp < timeAfterEvent,
+    ok(evt.timeStamp >= timeBeforeEvent &&
+       evt.timeStamp <= timeAfterEvent,
        "Event timestamp (" + evt.timeStamp + ") is in expected range: (" +
          timeBeforeEvent + ", " + timeAfterEvent + ")");
     testWorkerEvents();
@@ -74,11 +74,12 @@ function testWorkerEvents() {
   var worker = new Worker(window.URL.createObjectURL(blob));
   worker.onmessage = function(evt) {
     var timeAfterEvent = window.performance.now();
-    ok(evt.data > timeBeforeEvent &&
-       evt.data < timeAfterEvent,
-       "Event timestamp in dedicated worker (" + evt.data +
-         ") is in expected range: (" +
-         timeBeforeEvent + ", " + timeAfterEvent + ")");
+    // Comparing times across timelines may break now
+    // ok(evt.data >= timeBeforeEvent &&
+    //    evt.data <= timeAfterEvent,
+    //   "Event timestamp in dedicated worker (" + evt.data +
+    //     ") is in expected range: (" +
+    //     timeBeforeEvent + ", " + timeAfterEvent + ")");
     worker.terminate();
     testSharedWorkerEvents();
   };
@@ -97,11 +98,12 @@ function testSharedWorkerEvents() {
     var worker = new SharedWorker(window.URL.createObjectURL(blob));
     worker.port.onmessage = function(evt) {
       var timeAfterEvent = window.performance.now();
-      ok(evt.data > 0 &&
-         evt.data < timeAfterEvent - timeBeforeWorkerCreation,
-         "Event timestamp in shared worker (" + evt.data +
-           ") is in expected range: (0, " +
-           (timeAfterEvent - timeBeforeWorkerCreation) + ")");
+      // Comparing times across timelines may break now
+      // ok(evt.data >= 0 &&
+      //   evt.data <= timeAfterEvent - timeBeforeWorkerCreation,
+      //   "Event timestamp in shared worker (" + evt.data +
+      //     ") is in expected range: (0, " +
+      //     (timeAfterEvent - timeBeforeWorkerCreation) + ")");
       worker.port.close();
       finishTests();
     };
diff --git a/dom/ipc/PBrowser.ipdl b/dom/ipc/PBrowser.ipdl
index 249657c26..9dfccbc5c 100644
--- a/dom/ipc/PBrowser.ipdl
+++ b/dom/ipc/PBrowser.ipdl
@@ -11,7 +11,6 @@ include protocol PContent;
 include protocol PContentBridge;
 include protocol PDatePicker;
 include protocol PDocAccessible;
-include protocol PDocumentRenderer;
 include protocol PFilePicker;
 include protocol PIndexedDBPermissionRequest;
 include protocol PRenderFrame;
@@ -119,7 +118,6 @@ nested(upto inside_cpow) sync protocol PBrowser
     manages PColorPicker;
     manages PDatePicker;
     manages PDocAccessible;
-    manages PDocumentRenderer;
     manages PFilePicker;
     manages PIndexedDBPermissionRequest;
     manages PRenderFrame;
@@ -739,24 +737,6 @@ child:
     async LoadRemoteScript(nsString aURL, bool aRunInGlobalScope);
 
     /**
-     * Create a asynchronous request to render whatever document is
-     * loaded in the child when this message arrives.  When the
-     * request finishes, PDocumentRenderer:__delete__ is sent back to
-     * this side to notify completion.
-     *
-     * |documentRect| is the area of the remote document to draw,
-     * transformed by |transform|.  The rendered area will have the
-     * default background color |bgcolor|.  |renderFlags| are the
-     * nsIPresShell::RenderDocument() flags to use on the remote side,
-     * and if true, |flushLayout| will do just that before rendering
-     * the document.  The rendered image will be of size |renderSize|.
-     */
-    async PDocumentRenderer(nsRect documentRect, Matrix transform,
-                            nsString bgcolor,
-                            uint32_t renderFlags, bool flushLayout,
-                            IntSize renderSize);
-
-    /**
      * Sent by the chrome process when it no longer wants this remote
      * <browser>.  The child side cleans up in response, then
      * finalizing its death by sending back __delete__() to the
diff --git a/dom/ipc/PDocumentRenderer.ipdl b/dom/ipc/PDocumentRenderer.ipdl
deleted file mode 100644
index bdaed45d7..000000000
--- a/dom/ipc/PDocumentRenderer.ipdl
+++ /dev/null
@@ -1,25 +0,0 @@
-/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 8 -*- */
-/* 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 protocol PBrowser;
-
-include "mozilla/GfxMessageUtils.h";
-
-using nsIntSize from "nsSize.h";
-
-namespace mozilla {
-namespace ipc {
-
-protocol PDocumentRenderer
-{
-  manager PBrowser;
-
-parent:
-    // Returns the width and height, in pixels, of the returned ARGB32 data.
-    async __delete__(nsIntSize renderedSize, nsCString data);
-};
-
-} // namespace ipc
-} // namespace mozilla
diff --git a/dom/ipc/TabChild.cpp b/dom/ipc/TabChild.cpp
index eaf4a32ed..f46a917d5 100644
--- a/dom/ipc/TabChild.cpp
+++ b/dom/ipc/TabChild.cpp
@@ -22,7 +22,6 @@
 #include "mozilla/dom/indexedDB/PIndexedDBPermissionRequestChild.h"
 #include "mozilla/plugins/PluginWidgetChild.h"
 #include "mozilla/IMEStateManager.h"
-#include "mozilla/ipc/DocumentRendererChild.h"
 #include "mozilla/ipc/URIUtils.h"
 #include "mozilla/layers/APZChild.h"
 #include "mozilla/layers/APZCCallbackHelper.h"
@@ -2006,57 +2005,6 @@ TabChild::DeallocPDocAccessibleChild(a11y::PDocAccessibleChild* aChild)
   return true;
 }
 
-PDocumentRendererChild*
-TabChild::AllocPDocumentRendererChild(const nsRect& documentRect,
-                                      const mozilla::gfx::Matrix& transform,
-                                      const nsString& bgcolor,
-                                      const uint32_t& renderFlags,
-                                      const bool& flushLayout,
-                                      const nsIntSize& renderSize)
-{
-    return new DocumentRendererChild();
-}
-
-bool
-TabChild::DeallocPDocumentRendererChild(PDocumentRendererChild* actor)
-{
-    delete actor;
-    return true;
-}
-
-bool
-TabChild::RecvPDocumentRendererConstructor(PDocumentRendererChild* actor,
-                                           const nsRect& documentRect,
-                                           const mozilla::gfx::Matrix& transform,
-                                           const nsString& bgcolor,
-                                           const uint32_t& renderFlags,
-                                           const bool& flushLayout,
-                                           const nsIntSize& renderSize)
-{
-    DocumentRendererChild *render = static_cast<DocumentRendererChild *>(actor);
-
-    nsCOMPtr<nsIWebBrowser> browser = do_QueryInterface(WebNavigation());
-    if (!browser)
-        return true; // silently ignore
-    nsCOMPtr<mozIDOMWindowProxy> window;
-    if (NS_FAILED(browser->GetContentDOMWindow(getter_AddRefs(window))) ||
-        !window)
-    {
-        return true; // silently ignore
-    }
-
-    nsCString data;
-    bool ret = render->RenderDocument(nsPIDOMWindowOuter::From(window),
-                                      documentRect, transform,
-                                      bgcolor,
-                                      renderFlags, flushLayout,
-                                      renderSize, data);
-    if (!ret)
-        return true; // silently ignore
-
-    return PDocumentRendererChild::Send__delete__(actor, renderSize, data);
-}
-
 PColorPickerChild*
 TabChild::AllocPColorPickerChild(const nsString&, const nsString&)
 {
diff --git a/dom/ipc/TabChild.h b/dom/ipc/TabChild.h
index b23c7c19e..2232ffeaf 100644
--- a/dom/ipc/TabChild.h
+++ b/dom/ipc/TabChild.h
@@ -445,27 +445,6 @@ public:
 
   virtual bool DeallocPDocAccessibleChild(PDocAccessibleChild*) override;
 
-  virtual PDocumentRendererChild*
-  AllocPDocumentRendererChild(const nsRect& aDocumentRect,
-                              const gfx::Matrix& aTransform,
-                              const nsString& aBggcolor,
-                              const uint32_t& aRenderFlags,
-                              const bool& aFlushLayout,
-                              const nsIntSize& arenderSize) override;
-
-  virtual bool
-  DeallocPDocumentRendererChild(PDocumentRendererChild* aCctor) override;
-
-  virtual bool
-  RecvPDocumentRendererConstructor(PDocumentRendererChild* aActor,
-                                   const nsRect& aDocumentRect,
-                                   const gfx::Matrix& aTransform,
-                                   const nsString& aBgcolor,
-                                   const uint32_t& aRenderFlags,
-                                   const bool& aFlushLayout,
-                                   const nsIntSize& aRenderSize) override;
-
-
   virtual PColorPickerChild*
   AllocPColorPickerChild(const nsString& aTitle,
                          const nsString& aInitialColor) override;
diff --git a/dom/ipc/TabParent.cpp b/dom/ipc/TabParent.cpp
index 0df4c1253..8e98de3ce 100644
--- a/dom/ipc/TabParent.cpp
+++ b/dom/ipc/TabParent.cpp
@@ -28,7 +28,6 @@
 #include "mozilla/gfx/GPUProcessManager.h"
 #include "mozilla/Hal.h"
 #include "mozilla/IMEStateManager.h"
-#include "mozilla/ipc/DocumentRendererParent.h"
 #include "mozilla/jsipc/CrossProcessObjectWrappers.h"
 #include "mozilla/layers/AsyncDragMetrics.h"
 #include "mozilla/layers/InputAPZContext.h"
@@ -957,24 +956,6 @@ TabParent::GetTopLevelDocAccessible() const
   return nullptr;
 }
 
-PDocumentRendererParent*
-TabParent::AllocPDocumentRendererParent(const nsRect& documentRect,
-                                        const gfx::Matrix& transform,
-                                        const nsString& bgcolor,
-                                        const uint32_t& renderFlags,
-                                        const bool& flushLayout,
-                                        const nsIntSize& renderSize)
-{
-    return new DocumentRendererParent();
-}
-
-bool
-TabParent::DeallocPDocumentRendererParent(PDocumentRendererParent* actor)
-{
-    delete actor;
-    return true;
-}
-
 PFilePickerParent*
 TabParent::AllocPFilePickerParent(const nsString& aTitle, const int16_t& aMode)
 {
diff --git a/dom/ipc/TabParent.h b/dom/ipc/TabParent.h
index 43afb0538..09bb999f3 100644
--- a/dom/ipc/TabParent.h
+++ b/dom/ipc/TabParent.h
@@ -473,17 +473,6 @@ public:
                      const ScrollableLayerGuid& aGuid,
                      uint64_t aInputBlockId);
 
-  virtual PDocumentRendererParent*
-  AllocPDocumentRendererParent(const nsRect& documentRect,
-                               const gfx::Matrix& transform,
-                               const nsString& bgcolor,
-                               const uint32_t& renderFlags,
-                               const bool& flushLayout,
-                               const nsIntSize& renderSize) override;
-
-  virtual bool
-  DeallocPDocumentRendererParent(PDocumentRendererParent* actor) override;
-
   virtual PFilePickerParent*
   AllocPFilePickerParent(const nsString& aTitle,
                          const int16_t& aMode) override;
diff --git a/dom/ipc/moz.build b/dom/ipc/moz.build
index 153bd3aae..ff3880bc2 100644
--- a/dom/ipc/moz.build
+++ b/dom/ipc/moz.build
@@ -96,7 +96,6 @@ IPDL_SOURCES += [
     'PCrashReporter.ipdl',
     'PCycleCollectWithLogs.ipdl',
     'PDatePicker.ipdl',
-    'PDocumentRenderer.ipdl',
     'PFilePicker.ipdl',
     'PMemoryReportRequest.ipdl',
     'PPluginWidget.ipdl',
diff --git a/dom/media/DOMMediaStream.cpp b/dom/media/DOMMediaStream.cpp
index 6794ee32f..c1d451035 100644..100755
--- a/dom/media/DOMMediaStream.cpp
+++ b/dom/media/DOMMediaStream.cpp
@@ -9,6 +9,7 @@
 #include "nsIScriptError.h"
 #include "nsIUUIDGenerator.h"
 #include "nsPIDOMWindow.h"
+#include "mozilla/TimerClamping.h"
 #include "mozilla/dom/MediaStreamBinding.h"
 #include "mozilla/dom/MediaStreamTrackEvent.h"
 #include "mozilla/dom/LocalMediaStreamBinding.h"
@@ -544,8 +545,8 @@ DOMMediaStream::CurrentTime()
   if (!mPlaybackStream) {
     return 0.0;
   }
-  return mPlaybackStream->
-    StreamTimeToSeconds(mPlaybackStream->GetCurrentTime() - mLogicalStreamStartTime);
+  return TimerClamping::ReduceSTimeValue(mPlaybackStream->
+    StreamTimeToSeconds(mPlaybackStream->GetCurrentTime() - mLogicalStreamStartTime));
 }
 
 void
diff --git a/dom/media/MediaData.cpp b/dom/media/MediaData.cpp
index 0439a7473..4a52c22ae 100644
--- a/dom/media/MediaData.cpp
+++ b/dom/media/MediaData.cpp
@@ -90,7 +90,7 @@ ValidatePlane(const VideoData::YCbCrBuffer::Plane& aPlane)
   return aPlane.mWidth <= PlanarYCbCrImage::MAX_DIMENSION &&
          aPlane.mHeight <= PlanarYCbCrImage::MAX_DIMENSION &&
          aPlane.mWidth * aPlane.mHeight < MAX_VIDEO_WIDTH * MAX_VIDEO_HEIGHT &&
-         aPlane.mStride > 0;
+         aPlane.mStride > 0 && aPlane.mWidth <= aPlane.mStride;
 }
 
 #ifdef MOZ_WIDGET_GONK
diff --git a/dom/media/test/test_background_video_suspend.html b/dom/media/test/test_background_video_suspend.html
index e872eacf8..a5ac5cc2c 100644..100755
--- a/dom/media/test/test_background_video_suspend.html
+++ b/dom/media/test/test_background_video_suspend.html
@@ -15,7 +15,7 @@ var MIN_DELAY = 100;
 function testDelay(v, start, min) {
   let end = performance.now();
   let delay = end - start;
-  ok(delay > min, `${v.token} suspended with a delay of ${delay} ms`);
+  ok(delay >= min, `${v.token} suspended with a delay of ${delay} ms`);
 }
 
 startTest({
@@ -25,7 +25,7 @@ startTest({
     [ "media.suspend-bkgnd-video.enabled", true ],
     // User a short delay to ensure video decode suspend happens before end
     // of video.
-    [ "media.suspend-bkgnd-video.delay-ms", MIN_DELAY ]
+    [ "media.suspend-bkgnd-video.delay-ms", MIN_DELAY ],
   ],
   tests: gDecodeSuspendTests,
   runTest: (test, token) => {
diff --git a/dom/media/test/test_streams_element_capture.html b/dom/media/test/test_streams_element_capture.html
index 5e30a3ce4..a29eeef4d 100644..100755
--- a/dom/media/test/test_streams_element_capture.html
+++ b/dom/media/test/test_streams_element_capture.html
@@ -38,7 +38,8 @@ function startTest(test) {
   var stream;
 
   var checkEnded = function() {
-    is(stream.currentTime, vout.currentTime, test.name + " stream final currentTime");
+    // We know the video time won't match up to the stream time
+    // is(stream.currentTime, vout.currentTime, test.name + " stream final currentTime");
     if (test.duration) {
       isGreaterThanOrEqualEps(vout.currentTime, test.duration,
          test.name + " current time at end");
diff --git a/dom/media/test/test_streams_element_capture_createObjectURL.html b/dom/media/test/test_streams_element_capture_createObjectURL.html
index d5d7efc5c..d952c7142 100644..100755
--- a/dom/media/test/test_streams_element_capture_createObjectURL.html
+++ b/dom/media/test/test_streams_element_capture_createObjectURL.html
@@ -38,7 +38,8 @@ function startTest(test, token) {
   var stream;
 
   var checkEnded = function() {
-    is(stream.currentTime, vout.currentTime, test.name + " stream final currentTime");
+    // We know the video time won't match up to the stream time
+    // is(stream.currentTime, vout.currentTime, test.name + " stream final currentTime");
     if (test.duration) {
       isGreaterThanOrEqualEps(vout.currentTime, test.duration,
          test.name + " current time at end");
diff --git a/dom/media/webaudio/AudioContext.cpp b/dom/media/webaudio/AudioContext.cpp
index a36eda621..85842c811 100644..100755
--- a/dom/media/webaudio/AudioContext.cpp
+++ b/dom/media/webaudio/AudioContext.cpp
@@ -41,6 +41,7 @@
 #include "nsNetUtil.h"
 #include "nsPIDOMWindow.h"
 #include "nsPrintfCString.h"
+#include "mozilla/TimerClamping.h"
 #include "OscillatorNode.h"
 #include "PannerNode.h"
 #include "PeriodicWave.h"
@@ -746,7 +747,7 @@ double
 AudioContext::CurrentTime() const
 {
   MediaStream* stream = Destination()->Stream();
-  return stream->StreamTimeToSeconds(stream->GetCurrentTime());
+  return TimerClamping::ReduceSTimeValue(stream->StreamTimeToSeconds(stream->GetCurrentTime()));
 }
 
 void
diff --git a/dom/performance/Performance.cpp b/dom/performance/Performance.cpp
index 17273c55d..8dc239b05 100644..100755
--- a/dom/performance/Performance.cpp
+++ b/dom/performance/Performance.cpp
@@ -21,6 +21,7 @@
 #include "mozilla/dom/PerformanceObserverBinding.h"
 #include "mozilla/IntegerPrintfMacros.h"
 #include "mozilla/Preferences.h"
+#include "mozilla/TimerClamping.h"
 #include "WorkerPrivate.h"
 #include "WorkerRunnable.h"
 
@@ -228,9 +229,9 @@ Performance::ClearResourceTimings()
 DOMHighResTimeStamp
 Performance::RoundTime(double aTime) const
 {
-  // Round down to the nearest 20us, because if the timer is too accurate people
+  // Round down to the nearest 2ms, because if the timer is too accurate people
   // can do nasty timing attacks with it.
-  const double maxResolutionMs = 0.020;
+  const double maxResolutionMs = 2;
   return floor(aTime / maxResolutionMs) * maxResolutionMs;
 }
 
diff --git a/dom/performance/PerformanceTiming.cpp b/dom/performance/PerformanceTiming.cpp
index 4070b6a0f..97bbcb0ca 100644..100755
--- a/dom/performance/PerformanceTiming.cpp
+++ b/dom/performance/PerformanceTiming.cpp
@@ -21,7 +21,7 @@ PerformanceTiming::PerformanceTiming(Performance* aPerformance,
                                      DOMHighResTimeStamp aZeroTime)
   : mPerformance(aPerformance),
     mFetchStart(0.0),
-    mZeroTime(aZeroTime),
+    mZeroTime(TimerClamping::ReduceMsTimeValue(aZeroTime)),
     mRedirectCount(0),
     mTimingAllowed(true),
     mAllRedirectsSameOrigin(true),
@@ -117,7 +117,7 @@ PerformanceTiming::FetchStartHighRes()
         ? TimeStampToDOMHighRes(mAsyncOpen)
         : 0.0;
   }
-  return mFetchStart;
+  return TimerClamping::ReduceMsTimeValue(mFetchStart);
 }
 
 DOMTimeMilliSec
@@ -203,7 +203,7 @@ PerformanceTiming::RedirectStartHighRes()
   if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
     return mZeroTime;
   }
-  return TimeStampToDOMHighResOrFetchStart(mRedirectStart);
+  return TimeStampToReducedDOMHighResOrFetchStart(mRedirectStart);
 }
 
 DOMTimeMilliSec
@@ -236,7 +236,7 @@ PerformanceTiming::RedirectEndHighRes()
   if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
     return mZeroTime;
   }
-  return TimeStampToDOMHighResOrFetchStart(mRedirectEnd);
+  return TimeStampToReducedDOMHighResOrFetchStart(mRedirectEnd);
 }
 
 DOMTimeMilliSec
@@ -259,7 +259,7 @@ PerformanceTiming::DomainLookupStartHighRes()
   if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
     return mZeroTime;
   }
-  return TimeStampToDOMHighResOrFetchStart(mDomainLookupStart);
+  return TimeStampToReducedDOMHighResOrFetchStart(mDomainLookupStart);
 }
 
 DOMTimeMilliSec
@@ -276,7 +276,7 @@ PerformanceTiming::DomainLookupEndHighRes()
   }
   // Bug 1155008 - nsHttpTransaction is racy. Return DomainLookupStart when null
   return mDomainLookupEnd.IsNull() ? DomainLookupStartHighRes()
-                                   : TimeStampToDOMHighRes(mDomainLookupEnd);
+                                   : TimerClamping::ReduceMsTimeValue(TimeStampToDOMHighRes(mDomainLookupEnd));
 }
 
 DOMTimeMilliSec
@@ -292,7 +292,7 @@ PerformanceTiming::ConnectStartHighRes()
     return mZeroTime;
   }
   return mConnectStart.IsNull() ? DomainLookupEndHighRes()
-                                : TimeStampToDOMHighRes(mConnectStart);
+                                : TimerClamping::ReduceMsTimeValue(TimeStampToDOMHighRes(mConnectStart));
 }
 
 DOMTimeMilliSec
@@ -329,7 +329,7 @@ PerformanceTiming::ConnectEndHighRes()
   }
   // Bug 1155008 - nsHttpTransaction is racy. Return ConnectStart when null
   return mConnectEnd.IsNull() ? ConnectStartHighRes()
-                              : TimeStampToDOMHighRes(mConnectEnd);
+                              : TimerClamping::ReduceMsTimeValue(TimeStampToDOMHighRes(mConnectEnd));
 }
 
 DOMTimeMilliSec
@@ -344,7 +344,7 @@ PerformanceTiming::RequestStartHighRes()
   if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
     return mZeroTime;
   }
-  return TimeStampToDOMHighResOrFetchStart(mRequestStart);
+  return TimeStampToReducedDOMHighResOrFetchStart(mRequestStart);
 }
 
 DOMTimeMilliSec
@@ -363,7 +363,7 @@ PerformanceTiming::ResponseStartHighRes()
      (!mCacheReadStart.IsNull() && mCacheReadStart < mResponseStart)) {
     mResponseStart = mCacheReadStart;
   }
-  return TimeStampToDOMHighResOrFetchStart(mResponseStart);
+  return TimeStampToReducedDOMHighResOrFetchStart(mResponseStart);
 }
 
 DOMTimeMilliSec
@@ -384,7 +384,7 @@ PerformanceTiming::ResponseEndHighRes()
   }
   // Bug 1155008 - nsHttpTransaction is racy. Return ResponseStart when null
   return mResponseEnd.IsNull() ? ResponseStartHighRes()
-                               : TimeStampToDOMHighRes(mResponseEnd);
+                               : TimerClamping::ReduceMsTimeValue(TimeStampToDOMHighRes(mResponseEnd));
 }
 
 DOMTimeMilliSec
diff --git a/dom/performance/PerformanceTiming.h b/dom/performance/PerformanceTiming.h
index 0bc73fd3f..edfac8d02 100644..100755
--- a/dom/performance/PerformanceTiming.h
+++ b/dom/performance/PerformanceTiming.h
@@ -10,6 +10,7 @@
 #include "mozilla/Attributes.h"
 #include "nsContentUtils.h"
 #include "nsDOMNavigationTiming.h"
+#include "mozilla/TimerClamping.h"
 #include "nsWrapperCache.h"
 #include "Performance.h"
 
@@ -68,10 +69,10 @@ public:
    *          page), if the given TimeStamp is valid. Otherwise, it will return
    *          the FetchStart timing value.
    */
-  inline DOMHighResTimeStamp TimeStampToDOMHighResOrFetchStart(TimeStamp aStamp)
+  inline DOMHighResTimeStamp TimeStampToReducedDOMHighResOrFetchStart(TimeStamp aStamp)
   {
     return (!aStamp.IsNull())
-        ? TimeStampToDOMHighRes(aStamp)
+        ? TimerClamping::ReduceMsTimeValue(TimeStampToDOMHighRes(aStamp))
         : FetchStartHighRes();
   }
 
@@ -119,7 +120,7 @@ public:
     if (!nsContentUtils::IsPerformanceTimingEnabled()) {
       return 0;
     }
-    return GetDOMTiming()->GetNavigationStart();
+    return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetNavigationStart());
   }
 
   DOMTimeMilliSec UnloadEventStart()
@@ -127,7 +128,7 @@ public:
     if (!nsContentUtils::IsPerformanceTimingEnabled()) {
       return 0;
     }
-    return GetDOMTiming()->GetUnloadEventStart();
+    return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetUnloadEventStart());
   }
 
   DOMTimeMilliSec UnloadEventEnd()
@@ -135,7 +136,7 @@ public:
     if (!nsContentUtils::IsPerformanceTimingEnabled()) {
       return 0;
     }
-    return GetDOMTiming()->GetUnloadEventEnd();
+    return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetUnloadEventEnd());
   }
 
   uint16_t GetRedirectCount() const;
@@ -185,7 +186,7 @@ public:
     if (!nsContentUtils::IsPerformanceTimingEnabled()) {
       return 0;
     }
-    return GetDOMTiming()->GetDomLoading();
+    return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetDomLoading());
   }
 
   DOMTimeMilliSec DomInteractive() const
@@ -193,7 +194,7 @@ public:
     if (!nsContentUtils::IsPerformanceTimingEnabled()) {
       return 0;
     }
-    return GetDOMTiming()->GetDomInteractive();
+    return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetDomInteractive());
   }
 
   DOMTimeMilliSec DomContentLoadedEventStart() const
@@ -201,7 +202,7 @@ public:
     if (!nsContentUtils::IsPerformanceTimingEnabled()) {
       return 0;
     }
-    return GetDOMTiming()->GetDomContentLoadedEventStart();
+    return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetDomContentLoadedEventStart());
   }
 
   DOMTimeMilliSec DomContentLoadedEventEnd() const
@@ -209,7 +210,7 @@ public:
     if (!nsContentUtils::IsPerformanceTimingEnabled()) {
       return 0;
     }
-    return GetDOMTiming()->GetDomContentLoadedEventEnd();
+    return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetDomContentLoadedEventEnd());
   }
 
   DOMTimeMilliSec DomComplete() const
@@ -217,7 +218,7 @@ public:
     if (!nsContentUtils::IsPerformanceTimingEnabled()) {
       return 0;
     }
-    return GetDOMTiming()->GetDomComplete();
+    return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetDomComplete());
   }
 
   DOMTimeMilliSec LoadEventStart() const
@@ -225,7 +226,7 @@ public:
     if (!nsContentUtils::IsPerformanceTimingEnabled()) {
       return 0;
     }
-    return GetDOMTiming()->GetLoadEventStart();
+    return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetLoadEventStart());
   }
 
   DOMTimeMilliSec LoadEventEnd() const
@@ -233,7 +234,7 @@ public:
     if (!nsContentUtils::IsPerformanceTimingEnabled()) {
       return 0;
     }
-    return GetDOMTiming()->GetLoadEventEnd();
+    return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetLoadEventEnd());
   }
 
 private:
diff --git a/dom/performance/tests/test_worker_performance_now.js b/dom/performance/tests/test_worker_performance_now.js
index c2a905031..dee4efce6 100644
--- a/dom/performance/tests/test_worker_performance_now.js
+++ b/dom/performance/tests/test_worker_performance_now.js
@@ -26,51 +26,5 @@ 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;
+workerTestDone();
 
-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/svg/DOMSVGPathSegList.cpp b/dom/svg/DOMSVGPathSegList.cpp
index edacdfc93..0b811cdb1 100644
--- a/dom/svg/DOMSVGPathSegList.cpp
+++ b/dom/svg/DOMSVGPathSegList.cpp
@@ -460,6 +460,18 @@ DOMSVGPathSegList::ReplaceItem(DOMSVGPathSeg& aNewItem,
   float segAsRaw[1 + NS_SVG_PATH_SEG_MAX_ARGS];
   domItem->ToSVGPathSegEncodedData(segAsRaw);
 
+  if (AnimListMirrorsBaseList()) {
+    // The anim val list is in sync with the base val list - remove mirroring
+    // animVal item if necessary.  We do this *before* touching InternalList()
+    // so the removed item can correctly store its internal value.
+    DOMSVGPathSegList* animVal =
+      GetDOMWrapperIfExists(InternalAList().GetAnimValKey());
+    if (animVal->ItemAt(aIndex)) {
+      animVal->ItemAt(aIndex)->RemovingFromList();
+      animVal->ItemAt(aIndex) = nullptr;
+    }
+  }
+
   if (!InternalList().mData.ReplaceElementsAt(internalIndex, 1 + oldArgCount,
                                               segAsRaw, 1 + newArgCount,
                                               fallible)) {
@@ -474,8 +486,13 @@ DOMSVGPathSegList::ReplaceItem(DOMSVGPathSeg& aNewItem,
 
   int32_t delta = newArgCount - oldArgCount;
   if (delta != 0) {
-    for (uint32_t i = aIndex + 1; i < LengthNoFlush(); ++i) {
-      mItems[i].mInternalDataIndex += delta;
+    // Sync up the internal indexes of all ItemProxys that come after aIndex:
+    UpdateListIndicesFromIndex(aIndex + 1, delta);
+    if (AnimListMirrorsBaseList()) {
+      // The anim val list is in sync with the base val list
+      DOMSVGPathSegList* animVal =
+        GetDOMWrapperIfExists(InternalAList().GetAnimValKey());
+      animVal->UpdateListIndicesFromIndex(aIndex + 1, delta);
     }
   }
 
diff --git a/dom/tests/browser/browser.ini b/dom/tests/browser/browser.ini
index 35ebd56c6..4d3a60a2c 100644..100755
--- a/dom/tests/browser/browser.ini
+++ b/dom/tests/browser/browser.ini
@@ -8,6 +8,7 @@ support-files =
   worker_bug1004814.js
   geo_leak_test.html
   dummy.html
+  file_workerPerformance.js
   test_largeAllocation.html
   test_largeAllocation.html^headers^
   !/dom/tests/mochitest/geolocation/network_geolocation.sjs
@@ -44,3 +45,4 @@ support-files =
 support-files =
   test_new_window_from_content_child.html
 [browser_xhr_sandbox.js]
+[browser_performanceAPI.js]
diff --git a/dom/tests/browser/browser_performanceAPI.js b/dom/tests/browser/browser_performanceAPI.js
new file mode 100755
index 000000000..2c28fe3d1
--- /dev/null
+++ b/dom/tests/browser/browser_performanceAPI.js
@@ -0,0 +1,139 @@
+/**
+ * Bug 1369303 - A test for making sure that performance APIs have been correctly
+ *   spoofed or disabled.
+ */
+
+const TEST_PATH = "http://example.net/browser/" +
+                  "dom/tests/browser/";
+
+const PERFORMANCE_TIMINGS = [
+  "navigationStart",
+  "unloadEventStart",
+  "unloadEventEnd",
+  "redirectStart",
+  "redirectEnd",
+  "fetchStart",
+  "domainLookupStart",
+  "domainLookupEnd",
+  "connectStart",
+  "connectEnd",
+  "requestStart",
+  "responseStart",
+  "responseEnd",
+  "domLoading",
+  "domInteractive",
+  "domContentLoadedEventStart",
+  "domContentLoadedEventEnd",
+  "domComplete",
+  "loadEventStart",
+  "loadEventEnd",
+];
+
+let isRounded = (x, expectedPrecision) => {
+  let rounded = (Math.floor(x / expectedPrecision) * expectedPrecision);
+  // First we do the perfectly normal check that should work just fine
+  if (rounded === x || x === 0)
+    return true;
+
+  // When we're diving by non-whole numbers, we may not get perfect
+  // multiplication/division because of floating points
+  if (Math.abs(rounded - x + expectedPrecision) < .0000001) {
+    return true;
+  } else if (Math.abs(rounded - x) < .0000001) {
+    return true;
+  }
+
+  // Then we handle the case where you're sub-millisecond and the timer is not
+  // We check that the timer is not sub-millisecond by assuming it is not if it
+  // returns an even number of milliseconds
+  if (expectedPrecision < 1 && Math.round(x) == x) {
+    if (Math.round(rounded) == x) {
+      return true;
+    }
+  }
+
+  ok(false, "Looming Test Failure, Additional Debugging Info: Expected Precision: " + expectedPrecision + " Measured Value: " + x +
+    " Rounded Vaue: " + rounded + " Fuzzy1: " + Math.abs(rounded - x + expectedPrecision) +
+    " Fuzzy 2: " + Math.abs(rounded - x));
+
+  return false;
+};
+
+// ================================================================================================
+// ================================================================================================
+add_task(function* () {
+  let tab = yield BrowserTestUtils.openNewForegroundTab(
+    gBrowser, TEST_PATH + "dummy.html");
+
+  yield ContentTask.spawn(tab.linkedBrowser, {
+      list: PERFORMANCE_TIMINGS,
+      precision: 2,
+      isRoundedFunc: isRounded.toString()
+    }, (data) => {
+    let timerlist = data.list;
+    let expectedPrecision = data.precision;
+    // eslint beleives that isrounded is available in this scope, but if you
+    // remove the assignment, you will see it is not
+    // eslint-disable-next-line
+    let isRounded = eval(data.isRoundedFunc);
+
+    // Check that whether the performance timing API is correctly spoofed.
+    for (let time of timerlist) {
+      ok(isRounded(content.performance.timing[time], expectedPrecision), `For reduceTimerPrecision(` + expectedPrecision + `), the timing(${time}) is not correctly rounded: ` + content.performance.timing[time]);
+    }
+
+    // Try to add some entries.
+    content.performance.mark("Test");
+    content.performance.mark("Test-End");
+    content.performance.measure("Test-Measure", "Test", "Test-End");
+
+    // Check the entries for performance.getEntries/getEntriesByType/getEntriesByName.
+    is(content.performance.getEntries().length, 3, "For reduceTimerPrecision, there should be 3 entries for performance.getEntries()");
+    for (var i = 0; i < 3; i++) {
+      let startTime = content.performance.getEntries()[i].startTime;
+      let duration = content.performance.getEntries()[i].duration;
+      ok(isRounded(startTime, expectedPrecision), "For reduceTimerPrecision(" + expectedPrecision + "), performance.getEntries(" + i + ").startTime is not rounded: " + startTime);
+      ok(isRounded(duration, expectedPrecision), "For reduceTimerPrecision(" + expectedPrecision + "), performance.getEntries(" + i + ").duration is not rounded: " + duration);
+    }
+    is(content.performance.getEntriesByType("mark").length, 2, "For reduceTimerPrecision, there should be 2 entries for performance.getEntriesByType()");
+    is(content.performance.getEntriesByName("Test", "mark").length, 1, "For reduceTimerPrecision, there should be 1 entry for performance.getEntriesByName()");
+    content.performance.clearMarks();
+    content.performance.clearMeasures();
+    content.performance.clearResourceTimings();
+  });
+  gBrowser.removeTab(tab);
+});
+
+// ================================================================================================
+// ================================================================================================
+add_task(function*() {
+  let tab = yield BrowserTestUtils.openNewForegroundTab(
+    gBrowser, TEST_PATH + "dummy.html");
+
+  yield ContentTask.spawn(tab.linkedBrowser, {
+    list: PERFORMANCE_TIMINGS,
+    precision: 2,
+    isRoundedFunc: isRounded.toString()
+  }, (data) => {
+    let expectedPrecision = data.precision;
+    let workerCall = data.workerCall;
+    return new Promise(resolve => {
+      let worker = new content.Worker("file_workerPerformance.js");
+      worker.onmessage = function(e) {
+        if (e.data.type == "status") {
+          ok(e.data.status, e.data.msg);
+        } else if (e.data.type == "finish") {
+          worker.terminate();
+          resolve();
+        } else {
+          ok(false, "Unknown message type");
+          worker.terminate();
+          resolve();
+        }
+      };
+    worker.postMessage({precision: expectedPrecision});
+    });
+  });
+
+  gBrowser.removeTab(tab);
+});
diff --git a/dom/tests/browser/file_workerPerformance.js b/dom/tests/browser/file_workerPerformance.js
new file mode 100755
index 000000000..c77ba4377
--- /dev/null
+++ b/dom/tests/browser/file_workerPerformance.js
@@ -0,0 +1,65 @@
+function ok(a, msg) {
+  postMessage({type: "status", status: !!a, msg});
+}
+
+function is(a, b, msg) {
+  ok(a === b, msg);
+}
+
+function finish() {
+  postMessage({type: "finish"});
+}
+
+let isRounded = (x, expectedPrecision) => {
+  let rounded = (Math.floor(x / expectedPrecision) * expectedPrecision);
+  // First we do the perfectly normal check that should work just fine
+  if (rounded === x || x === 0)
+    return true;
+
+  // When we're diving by non-whole numbers, we may not get perfect
+  // multiplication/division because of floating points
+  if (Math.abs(rounded - x + expectedPrecision) < .0000001) {
+    return true;
+  } else if (Math.abs(rounded - x) < .0000001) {
+    return true;
+  }
+
+  // Then we handle the case where you're sub-millisecond and the timer is not
+  // We check that the timer is not sub-millisecond by assuming it is not if it
+  // returns an even number of milliseconds
+  if (expectedPrecision < 1 && Math.round(x) == x) {
+    if (Math.round(rounded) == x) {
+      return true;
+    }
+  }
+
+  ok(false, "Looming Test Failure, Additional Debugging Info: Expected Precision: " + expectedPrecision + " Measured Value: " + x +
+    " Rounded Vaue: " + rounded + " Fuzzy1: " + Math.abs(rounded - x + expectedPrecision) +
+    " Fuzzy 2: " + Math.abs(rounded - x));
+
+  return false;
+};
+
+function runRTPTests(expectedPrecision) {
+  // Try to add some entries.
+  performance.mark("Test");
+  performance.mark("Test-End");
+  performance.measure("Test-Measure", "Test", "Test-End");
+
+  // Check the entries in performance.getEntries/getEntriesByType/getEntriesByName.
+  is(performance.getEntries().length, 3, "In a worker, for reduceTimerPrecision: Incorrect number of entries for performance.getEntries() for workers: " + performance.getEntries().length);
+  for (var i = 0; i < 3; i++) {
+    let startTime = performance.getEntries()[i].startTime;
+    let duration = performance.getEntries()[i].duration;
+    ok(isRounded(startTime, expectedPrecision), "In a worker, for reduceTimerPrecision(" + expectedPrecision + "), performance.getEntries(" + i.toString() + ").startTime is not rounded: " + startTime.toString());
+    ok(isRounded(duration, expectedPrecision), "In a worker, for reduceTimerPrecision(" + expectedPrecision + "), performance.getEntries(" + i.toString() + ").duration is not rounded: " + duration.toString());
+  }
+  is(performance.getEntriesByType("mark").length, 2, "In a worker, for reduceTimerPrecision: Incorrect number of entries for performance.getEntriesByType() for workers: " + performance.getEntriesByType("resource").length);
+  is(performance.getEntriesByName("Test", "mark").length, 1, "In a worker, for reduceTimerPrecision: Incorrect number of entries for performance.getEntriesByName() for workers: " + performance.getEntriesByName("Test", "mark").length);
+
+  finish();
+}
+
+self.onmessage = function(e) {
+  runRTPTests(e.data.precision);
+};
diff --git a/dom/tests/mochitest/general/mochitest.ini b/dom/tests/mochitest/general/mochitest.ini
index d59527801..d00ea1d4b 100644..100755
--- a/dom/tests/mochitest/general/mochitest.ini
+++ b/dom/tests/mochitest/general/mochitest.ini
@@ -43,6 +43,8 @@ support-files =
   frameStoragePrevented.html
   frameStorageChrome.html
   frameStorageNullprincipal.sjs
+  worker_child.js
+  worker_grandchild.js
   workerStorageAllowed.js
   workerStoragePrevented.js
   storagePermissionsUtils.js
@@ -108,6 +110,7 @@ support-files = test_offsets.js
 [test_picture_mutations.html]
 [test_pointerPreserves3D.html]
 [test_pointerPreserves3DClip.html]
+[test_reduce_time_precision.html]
 [test_resource_timing.html]
 [test_resource_timing_cross_origin.html]
 [test_resource_timing_frameset.html]
diff --git a/dom/tests/mochitest/general/test_reduce_time_precision.html b/dom/tests/mochitest/general/test_reduce_time_precision.html
new file mode 100755
index 000000000..6f149f28d
--- /dev/null
+++ b/dom/tests/mochitest/general/test_reduce_time_precision.html
@@ -0,0 +1,143 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Tor bug
+https://trac.torproject.org/projects/tor/ticket/1517
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Tor Bug 1517 and Mozilla Bug 1424341</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/SpawnTask.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://trac.torproject.org/projects/tor/ticket/1517">Tor Bug 1517</a>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1424341">Mozilla Bug 1424341</a>
+
+<!-- Canvas for testing 'currentTime' -->
+<canvas id="test-canvas" width="100" height="100"></canvas>
+
+<!-- The main testing script -->
+<script type="application/javascript">
+  SimpleTest.requestFlakyTimeout("testing JS time-based fingerprinting");
+
+  // Prepare for test of AudioContext.currentTime
+  let audioContext = new AudioContext();
+  // Prepare for test of CanvasStream.currentTime
+  let canvas = document.getElementById("test-canvas");
+  let context = canvas.getContext("2d");
+  context.fillText("test", 20, 20);
+  let canvasStream = canvas.captureStream(25);
+
+  // Known ways to generate time stamps, in milliseconds
+  const timeStampCodes = [
+    "performance.now()",
+    "new Date().getTime()",
+    "new Event(\"\").timeStamp",
+    "new File([], \"\").lastModified",
+    "new File([], \"\").lastModifiedDate.getTime()",
+  ];
+  // These are measured in seconds, so we need to scale them up
+  var timeStampCodesDOM = timeStampCodes.concat([
+    "audioContext.currentTime * 1000",
+    "canvasStream.currentTime * 1000",
+  ]);
+
+  let isRounded = (x) => {
+    expectedPrecision = 2;
+    let rounded = (Math.floor(x / expectedPrecision) * expectedPrecision);
+    // First we do the perfectly normal check that should work just fine
+    if (rounded === x || x === 0)
+      return true;
+
+  // When we're diving by non-whole numbers, we may not get perfect
+  // multiplication/division because of floating points.
+  // When dealing with ms since epoch, a double's precision is on the order
+  // of 1/5 of a microsecond, so we use a value a little higher than that as
+  // our epsilon.
+  // To be clear, this error is introduced in our re-calculation of 'rounded'
+  // above in JavaScript.
+  if (Math.abs(rounded - x + expectedPrecision) < .0005) {
+    return true;
+  } else if (Math.abs(rounded - x) < .0005) {
+    return true;
+  }
+
+    // Then we handle the case where you're sub-millisecond and the timer is not
+    // We check that the timer is not sub-millisecond by assuming it is not if it
+    // returns an even number of milliseconds
+    if (expectedPrecision < 1 && Math.round(x) == x) {
+      if (Math.round(rounded) == x) {
+        return true;
+      }
+    }
+
+    ok(false, "Looming Test Failure, Additional Debugging Info: Expected Precision: " + expectedPrecision + " Measured Value: " + x +
+      " Rounded Vaue: " + rounded + " Fuzzy1: " + Math.abs(rounded - x + expectedPrecision) +
+      " Fuzzy 2: " + Math.abs(rounded - x));
+
+    return false;
+  };
+
+  // ================================================================================================
+  // ================================================================================================
+
+  function* checkWorker(worker) {
+    // The child worker will send the results back.
+    let checkWorkerTimeStamps = () => new Promise(function(resolve) {
+      let onMessage = function(event) {
+        worker.removeEventListener("message", onMessage);
+
+        let timeStamps = event.data;
+        for (let i = 0; i < timeStampCodes.length; i++) {
+          let timeStamp = timeStamps[i];
+          ok(isRounded(timeStamp),
+             "'" + timeStampCodes[i] +
+             "' should be rounded to nearest 2 ms in workers; saw " +
+             timeStamp);
+        }
+        resolve();
+      };
+      worker.addEventListener("message", onMessage);
+    });
+
+    // Send the codes to its child worker.
+    worker.postMessage(timeStampCodes);
+
+    // First, check the child's results.
+    yield checkWorkerTimeStamps();
+    // Then, check the grandchild's results.
+    yield checkWorkerTimeStamps();
+
+    worker.terminate();
+  }
+
+  add_task(function*() {
+    let worker = new Worker("worker_child.js");
+    // Allow ~550 ms to elapse, so we can get non-zero
+    // time values for all elements.
+    yield new Promise(resolve => window.setTimeout(resolve, 550));
+    yield checkWorker(worker);
+  });
+
+  // ================================================================================================
+  // ================================================================================================
+
+
+  add_task(function*() {
+    // Loop through each timeStampCode, evaluate it,
+    // and check if it is rounded
+    for (let timeStampCode of timeStampCodesDOM) {
+      let timeStamp = eval(timeStampCode);
+      ok(isRounded(timeStamp),
+         "'" + timeStampCode + "' should be rounded to nearest 2ms" +
+         " saw " + timeStamp);
+    }
+  });
+
+</script>
+
+
+</body>
+</html>
diff --git a/dom/tests/mochitest/general/worker_child.js b/dom/tests/mochitest/general/worker_child.js
new file mode 100755
index 000000000..fa340fc65
--- /dev/null
+++ b/dom/tests/mochitest/general/worker_child.js
@@ -0,0 +1,28 @@
+let timeStampCodes;
+let worker = new Worker("worker_grandchild.js");
+
+function listenToParent(event) {
+  self.removeEventListener("message", listenToParent);
+  timeStampCodes = event.data;
+
+  let timeStamps = [];
+  for (let timeStampCode of timeStampCodes) {
+    timeStamps.push(eval(timeStampCode));
+  }
+  // Send the timeStamps to the parent.
+  postMessage(timeStamps);
+
+  // Tell the grandchild to start.
+  worker.postMessage(timeStampCodes);
+}
+
+// The worker grandchild will send results back.
+function listenToChild(event) {
+  worker.removeEventListener("message", listenToChild);
+  // Pass the results to the parent.
+  postMessage(event.data);
+  worker.terminate();
+}
+
+worker.addEventListener("message", listenToChild);
+self.addEventListener("message", listenToParent);
diff --git a/dom/tests/mochitest/general/worker_grandchild.js b/dom/tests/mochitest/general/worker_grandchild.js
new file mode 100755
index 000000000..cd21508b2
--- /dev/null
+++ b/dom/tests/mochitest/general/worker_grandchild.js
@@ -0,0 +1,10 @@
+self.addEventListener("message", function(event) {
+  let timeStampCodes = event.data;
+
+  let timeStamps = [];
+  for (let timeStampCode of timeStampCodes) {
+    timeStamps.push(eval(timeStampCode));
+  }
+  // Send the timeStamps to the parent.
+  postMessage(timeStamps);
+});