Add m-esr52 at 52.6.0

1 files changed, 798 insertions, 0 deletions

diff --git a/gfx/angle/src/third_party/trace_event/trace_event.h b/gfx/angle/src/third_party/trace_event/trace_event.h
new file mode 100755
index 000000000..3c85d22ef
--- /dev/null
+++ b/gfx/angle/src/third_party/trace_event/trace_event.h
@@ -0,0 +1,798 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Trace events are for tracking application performance and resource usage.
+// Macros are provided to track:
+//    Begin and end of function calls
+//    Counters
+//
+// Events are issued against categories. Whereas LOG's
+// categories are statically defined, TRACE categories are created
+// implicitly with a string. For example:
+//   TRACE_EVENT_INSTANT0("MY_SUBSYSTEM", "SomeImportantEvent")
+//
+// Events can be INSTANT, or can be pairs of BEGIN and END in the same scope:
+//   TRACE_EVENT_BEGIN0("MY_SUBSYSTEM", "SomethingCostly")
+//   doSomethingCostly()
+//   TRACE_EVENT_END0("MY_SUBSYSTEM", "SomethingCostly")
+// Note: our tools can't always determine the correct BEGIN/END pairs unless
+// these are used in the same scope. Use ASYNC_BEGIN/ASYNC_END macros if you need them
+// to be in separate scopes.
+//
+// A common use case is to trace entire function scopes. This
+// issues a trace BEGIN and END automatically:
+//   void doSomethingCostly() {
+//     TRACE_EVENT0("MY_SUBSYSTEM", "doSomethingCostly");
+//     ...
+//   }
+//
+// Additional parameters can be associated with an event:
+//   void doSomethingCostly2(int howMuch) {
+//     TRACE_EVENT1("MY_SUBSYSTEM", "doSomethingCostly",
+//         "howMuch", howMuch);
+//     ...
+//   }
+//
+// The trace system will automatically add to this information the
+// current process id, thread id, and a timestamp in microseconds.
+//
+// To trace an asynchronous procedure such as an IPC send/receive, use ASYNC_BEGIN and
+// ASYNC_END:
+//   [single threaded sender code]
+//     static int send_count = 0;
+//     ++send_count;
+//     TRACE_EVENT_ASYNC_BEGIN0("ipc", "message", send_count);
+//     Send(new MyMessage(send_count));
+//   [receive code]
+//     void OnMyMessage(send_count) {
+//       TRACE_EVENT_ASYNC_END0("ipc", "message", send_count);
+//     }
+// The third parameter is a unique ID to match ASYNC_BEGIN/ASYNC_END pairs.
+// ASYNC_BEGIN and ASYNC_END can occur on any thread of any traced process. Pointers can
+// be used for the ID parameter, and they will be mangled internally so that
+// the same pointer on two different processes will not match. For example:
+//   class MyTracedClass {
+//    public:
+//     MyTracedClass() {
+//       TRACE_EVENT_ASYNC_BEGIN0("category", "MyTracedClass", this);
+//     }
+//     ~MyTracedClass() {
+//       TRACE_EVENT_ASYNC_END0("category", "MyTracedClass", this);
+//     }
+//   }
+//
+// Trace event also supports counters, which is a way to track a quantity
+// as it varies over time. Counters are created with the following macro:
+//   TRACE_COUNTER1("MY_SUBSYSTEM", "myCounter", g_myCounterValue);
+//
+// Counters are process-specific. The macro itself can be issued from any
+// thread, however.
+//
+// Sometimes, you want to track two counters at once. You can do this with two
+// counter macros:
+//   TRACE_COUNTER1("MY_SUBSYSTEM", "myCounter0", g_myCounterValue[0]);
+//   TRACE_COUNTER1("MY_SUBSYSTEM", "myCounter1", g_myCounterValue[1]);
+// Or you can do it with a combined macro:
+//   TRACE_COUNTER2("MY_SUBSYSTEM", "myCounter",
+//       "bytesPinned", g_myCounterValue[0],
+//       "bytesAllocated", g_myCounterValue[1]);
+// This indicates to the tracing UI that these counters should be displayed
+// in a single graph, as a summed area chart.
+//
+// Since counters are in a global namespace, you may want to disembiguate with a
+// unique ID, by using the TRACE_COUNTER_ID* variations.
+//
+// By default, trace collection is compiled in, but turned off at runtime.
+// Collecting trace data is the responsibility of the embedding
+// application. In Chrome's case, navigating to about:tracing will turn on
+// tracing and display data collected across all active processes.
+//
+//
+// Memory scoping note:
+// Tracing copies the pointers, not the string content, of the strings passed
+// in for category, name, and arg_names. Thus, the following code will
+// cause problems:
+//     char* str = strdup("impprtantName");
+//     TRACE_EVENT_INSTANT0("SUBSYSTEM", str);  // BAD!
+//     free(str);                   // Trace system now has dangling pointer
+//
+// To avoid this issue with the |name| and |arg_name| parameters, use the
+// TRACE_EVENT_COPY_XXX overloads of the macros at additional runtime overhead.
+// Notes: The category must always be in a long-lived char* (i.e. static const).
+//        The |arg_values|, when used, are always deep copied with the _COPY
+//        macros.
+//
+// When are string argument values copied:
+// const char* arg_values are only referenced by default:
+//     TRACE_EVENT1("category", "name",
+//                  "arg1", "literal string is only referenced");
+// Use TRACE_STR_COPY to force copying of a const char*:
+//     TRACE_EVENT1("category", "name",
+//                  "arg1", TRACE_STR_COPY("string will be copied"));
+// std::string arg_values are always copied:
+//     TRACE_EVENT1("category", "name",
+//                  "arg1", std::string("string will be copied"));
+//
+//
+// Thread Safety:
+// A thread safe singleton and mutex are used for thread safety. Category
+// enabled flags are used to limit the performance impact when the system
+// is not enabled.
+//
+// TRACE_EVENT macros first cache a pointer to a category. The categories are
+// statically allocated and safe at all times, even after exit. Fetching a
+// category is protected by the TraceLog::lock_. Multiple threads initializing
+// the static variable is safe, as they will be serialized by the lock and
+// multiple calls will return the same pointer to the category.
+//
+// Then the category_enabled flag is checked. This is a unsigned char, and
+// not intended to be multithread safe. It optimizes access to addTraceEvent
+// which is threadsafe internally via TraceLog::lock_. The enabled flag may
+// cause some threads to incorrectly call or skip calling addTraceEvent near
+// the time of the system being enabled or disabled. This is acceptable as
+// we tolerate some data loss while the system is being enabled/disabled and
+// because addTraceEvent is threadsafe internally and checks the enabled state
+// again under lock.
+//
+// Without the use of these static category pointers and enabled flags all
+// trace points would carry a significant performance cost of aquiring a lock
+// and resolving the category.
+
+#ifndef COMMON_TRACE_EVENT_H_
+#define COMMON_TRACE_EVENT_H_
+
+#include <string>
+
+#include "common/event_tracer.h"
+
+// By default, const char* argument values are assumed to have long-lived scope
+// and will not be copied. Use this macro to force a const char* to be copied.
+#define TRACE_STR_COPY(str) \
+    WebCore::TraceEvent::TraceStringWithCopy(str)
+
+// Records a pair of begin and end events called "name" for the current
+// scope, with 0, 1 or 2 associated arguments. If the category is not
+// enabled, then this does nothing.
+// - category and name strings must have application lifetime (statics or
+//   literals). They may not include " chars.
+#define TRACE_EVENT0(category, name) \
+    INTERNAL_TRACE_EVENT_ADD_SCOPED(category, name)
+#define TRACE_EVENT1(category, name, arg1_name, arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD_SCOPED(category, name, arg1_name, arg1_val)
+#define TRACE_EVENT2(category, name, arg1_name, arg1_val, arg2_name, arg2_val) \
+    INTERNAL_TRACE_EVENT_ADD_SCOPED(category, name, arg1_name, arg1_val, \
+        arg2_name, arg2_val)
+
+// Records a single event called "name" immediately, with 0, 1 or 2
+// associated arguments. If the category is not enabled, then this
+// does nothing.
+// - category and name strings must have application lifetime (statics or
+//   literals). They may not include " chars.
+#define TRACE_EVENT_INSTANT0(category, name) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
+        category, name, TRACE_EVENT_FLAG_NONE)
+#define TRACE_EVENT_INSTANT1(category, name, arg1_name, arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
+        category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
+#define TRACE_EVENT_INSTANT2(category, name, arg1_name, arg1_val, \
+        arg2_name, arg2_val) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
+        category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \
+        arg2_name, arg2_val)
+#define TRACE_EVENT_COPY_INSTANT0(category, name) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
+        category, name, TRACE_EVENT_FLAG_COPY)
+#define TRACE_EVENT_COPY_INSTANT1(category, name, arg1_name, arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
+        category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val)
+#define TRACE_EVENT_COPY_INSTANT2(category, name, arg1_name, arg1_val, \
+        arg2_name, arg2_val) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
+        category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, \
+        arg2_name, arg2_val)
+
+// Records a single BEGIN event called "name" immediately, with 0, 1 or 2
+// associated arguments. If the category is not enabled, then this
+// does nothing.
+// - category and name strings must have application lifetime (statics or
+//   literals). They may not include " chars.
+#define TRACE_EVENT_BEGIN0(category, name) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
+        category, name, TRACE_EVENT_FLAG_NONE)
+#define TRACE_EVENT_BEGIN1(category, name, arg1_name, arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
+        category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
+#define TRACE_EVENT_BEGIN2(category, name, arg1_name, arg1_val, \
+        arg2_name, arg2_val) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
+        category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \
+        arg2_name, arg2_val)
+#define TRACE_EVENT_COPY_BEGIN0(category, name) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
+        category, name, TRACE_EVENT_FLAG_COPY)
+#define TRACE_EVENT_COPY_BEGIN1(category, name, arg1_name, arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
+        category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val)
+#define TRACE_EVENT_COPY_BEGIN2(category, name, arg1_name, arg1_val, \
+        arg2_name, arg2_val) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
+        category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, \
+        arg2_name, arg2_val)
+
+// Records a single END event for "name" immediately. If the category
+// is not enabled, then this does nothing.
+// - category and name strings must have application lifetime (statics or
+//   literals). They may not include " chars.
+#define TRACE_EVENT_END0(category, name) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
+        category, name, TRACE_EVENT_FLAG_NONE)
+#define TRACE_EVENT_END1(category, name, arg1_name, arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
+        category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
+#define TRACE_EVENT_END2(category, name, arg1_name, arg1_val, \
+        arg2_name, arg2_val) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
+        category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \
+        arg2_name, arg2_val)
+#define TRACE_EVENT_COPY_END0(category, name) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
+        category, name, TRACE_EVENT_FLAG_COPY)
+#define TRACE_EVENT_COPY_END1(category, name, arg1_name, arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
+        category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val)
+#define TRACE_EVENT_COPY_END2(category, name, arg1_name, arg1_val, \
+        arg2_name, arg2_val) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
+        category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, \
+        arg2_name, arg2_val)
+
+// Records the value of a counter called "name" immediately. Value
+// must be representable as a 32 bit integer.
+// - category and name strings must have application lifetime (statics or
+//   literals). They may not include " chars.
+#define TRACE_COUNTER1(category, name, value) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \
+        category, name, TRACE_EVENT_FLAG_NONE, \
+        "value", static_cast<int>(value))
+#define TRACE_COPY_COUNTER1(category, name, value) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \
+        category, name, TRACE_EVENT_FLAG_COPY, \
+        "value", static_cast<int>(value))
+
+// Records the values of a multi-parted counter called "name" immediately.
+// The UI will treat value1 and value2 as parts of a whole, displaying their
+// values as a stacked-bar chart.
+// - category and name strings must have application lifetime (statics or
+//   literals). They may not include " chars.
+#define TRACE_COUNTER2(category, name, value1_name, value1_val, \
+        value2_name, value2_val) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \
+        category, name, TRACE_EVENT_FLAG_NONE, \
+        value1_name, static_cast<int>(value1_val), \
+        value2_name, static_cast<int>(value2_val))
+#define TRACE_COPY_COUNTER2(category, name, value1_name, value1_val, \
+        value2_name, value2_val) \
+    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \
+        category, name, TRACE_EVENT_FLAG_COPY, \
+        value1_name, static_cast<int>(value1_val), \
+        value2_name, static_cast<int>(value2_val))
+
+// Records the value of a counter called "name" immediately. Value
+// must be representable as a 32 bit integer.
+// - category and name strings must have application lifetime (statics or
+//   literals). They may not include " chars.
+// - |id| is used to disambiguate counters with the same name. It must either
+//   be a pointer or an integer value up to 64 bits. If it's a pointer, the bits
+//   will be xored with a hash of the process ID so that the same pointer on
+//   two different processes will not collide.
+#define TRACE_COUNTER_ID1(category, name, id, value) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \
+        category, name, id, TRACE_EVENT_FLAG_NONE, \
+        "value", static_cast<int>(value))
+#define TRACE_COPY_COUNTER_ID1(category, name, id, value) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \
+        category, name, id, TRACE_EVENT_FLAG_COPY, \
+        "value", static_cast<int>(value))
+
+// Records the values of a multi-parted counter called "name" immediately.
+// The UI will treat value1 and value2 as parts of a whole, displaying their
+// values as a stacked-bar chart.
+// - category and name strings must have application lifetime (statics or
+//   literals). They may not include " chars.
+// - |id| is used to disambiguate counters with the same name. It must either
+//   be a pointer or an integer value up to 64 bits. If it's a pointer, the bits
+//   will be xored with a hash of the process ID so that the same pointer on
+//   two different processes will not collide.
+#define TRACE_COUNTER_ID2(category, name, id, value1_name, value1_val, \
+        value2_name, value2_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \
+        category, name, id, TRACE_EVENT_FLAG_NONE, \
+        value1_name, static_cast<int>(value1_val), \
+        value2_name, static_cast<int>(value2_val))
+#define TRACE_COPY_COUNTER_ID2(category, name, id, value1_name, value1_val, \
+        value2_name, value2_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \
+        category, name, id, TRACE_EVENT_FLAG_COPY, \
+        value1_name, static_cast<int>(value1_val), \
+        value2_name, static_cast<int>(value2_val))
+
+// Records a single ASYNC_BEGIN event called "name" immediately, with 0, 1 or 2
+// associated arguments. If the category is not enabled, then this
+// does nothing.
+// - category and name strings must have application lifetime (statics or
+//   literals). They may not include " chars.
+// - |id| is used to match the ASYNC_BEGIN event with the ASYNC_END event. ASYNC
+//   events are considered to match if their category, name and id values all
+//   match. |id| must either be a pointer or an integer value up to 64 bits. If
+//   it's a pointer, the bits will be xored with a hash of the process ID so
+//   that the same pointer on two different processes will not collide.
+// An asynchronous operation can consist of multiple phases. The first phase is
+// defined by the ASYNC_BEGIN calls. Additional phases can be defined using the
+// ASYNC_STEP_BEGIN macros. When the operation completes, call ASYNC_END.
+// An async operation can span threads and processes, but all events in that
+// operation must use the same |name| and |id|. Each event can have its own
+// args.
+#define TRACE_EVENT_ASYNC_BEGIN0(category, name, id) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
+        category, name, id, TRACE_EVENT_FLAG_NONE)
+#define TRACE_EVENT_ASYNC_BEGIN1(category, name, id, arg1_name, arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
+        category, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
+#define TRACE_EVENT_ASYNC_BEGIN2(category, name, id, arg1_name, arg1_val, \
+        arg2_name, arg2_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
+        category, name, id, TRACE_EVENT_FLAG_NONE, \
+        arg1_name, arg1_val, arg2_name, arg2_val)
+#define TRACE_EVENT_COPY_ASYNC_BEGIN0(category, name, id) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
+        category, name, id, TRACE_EVENT_FLAG_COPY)
+#define TRACE_EVENT_COPY_ASYNC_BEGIN1(category, name, id, arg1_name, arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
+        category, name, id, TRACE_EVENT_FLAG_COPY, \
+        arg1_name, arg1_val)
+#define TRACE_EVENT_COPY_ASYNC_BEGIN2(category, name, id, arg1_name, arg1_val, \
+        arg2_name, arg2_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
+        category, name, id, TRACE_EVENT_FLAG_COPY, \
+        arg1_name, arg1_val, arg2_name, arg2_val)
+
+// Records a single ASYNC_STEP event for |step| immediately. If the category
+// is not enabled, then this does nothing. The |name| and |id| must match the
+// ASYNC_BEGIN event above. The |step| param identifies this step within the
+// async event. This should be called at the beginning of the next phase of an
+// asynchronous operation.
+#define TRACE_EVENT_ASYNC_STEP0(category, name, id, step) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP, \
+        category, name, id, TRACE_EVENT_FLAG_NONE, "step", step)
+#define TRACE_EVENT_ASYNC_STEP1(category, name, id, step, \
+                                      arg1_name, arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP, \
+        category, name, id, TRACE_EVENT_FLAG_NONE, "step", step, \
+        arg1_name, arg1_val)
+#define TRACE_EVENT_COPY_ASYNC_STEP0(category, name, id, step) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP, \
+        category, name, id, TRACE_EVENT_FLAG_COPY, "step", step)
+#define TRACE_EVENT_COPY_ASYNC_STEP1(category, name, id, step, \
+        arg1_name, arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP, \
+        category, name, id, TRACE_EVENT_FLAG_COPY, "step", step, \
+        arg1_name, arg1_val)
+
+// Records a single ASYNC_END event for "name" immediately. If the category
+// is not enabled, then this does nothing.
+#define TRACE_EVENT_ASYNC_END0(category, name, id) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
+        category, name, id, TRACE_EVENT_FLAG_NONE)
+#define TRACE_EVENT_ASYNC_END1(category, name, id, arg1_name, arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
+        category, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
+#define TRACE_EVENT_ASYNC_END2(category, name, id, arg1_name, arg1_val, \
+        arg2_name, arg2_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
+        category, name, id, TRACE_EVENT_FLAG_NONE, \
+        arg1_name, arg1_val, arg2_name, arg2_val)
+#define TRACE_EVENT_COPY_ASYNC_END0(category, name, id) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
+        category, name, id, TRACE_EVENT_FLAG_COPY)
+#define TRACE_EVENT_COPY_ASYNC_END1(category, name, id, arg1_name, arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
+        category, name, id, TRACE_EVENT_FLAG_COPY, \
+        arg1_name, arg1_val)
+#define TRACE_EVENT_COPY_ASYNC_END2(category, name, id, arg1_name, arg1_val, \
+        arg2_name, arg2_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
+        category, name, id, TRACE_EVENT_FLAG_COPY, \
+        arg1_name, arg1_val, arg2_name, arg2_val)
+
+// Creates a scope of a sampling state with the given category and name (both must
+// be constant strings). These states are intended for a sampling profiler.
+// Implementation note: we store category and name together because we don't
+// want the inconsistency/expense of storing two pointers.
+// |thread_bucket| is [0..2] and is used to statically isolate samples in one
+// thread from others.
+//
+// {  // The sampling state is set within this scope.
+//    TRACE_EVENT_SAMPLING_STATE_SCOPE_FOR_BUCKET(0, "category", "name");
+//    ...;
+// }
+#define TRACE_EVENT_SCOPED_SAMPLING_STATE_FOR_BUCKET(bucket_number, category, name) \
+    TraceEvent::SamplingStateScope<bucket_number> traceEventSamplingScope(category "\0" name);
+
+// Returns a current sampling state of the given bucket.
+// The format of the returned string is "category\0name".
+#define TRACE_EVENT_GET_SAMPLING_STATE_FOR_BUCKET(bucket_number) \
+    TraceEvent::SamplingStateScope<bucket_number>::current()
+
+// Sets a current sampling state of the given bucket.
+// |category| and |name| have to be constant strings.
+#define TRACE_EVENT_SET_SAMPLING_STATE_FOR_BUCKET(bucket_number, category, name) \
+    TraceEvent::SamplingStateScope<bucket_number>::set(category "\0" name)
+
+// Sets a current sampling state of the given bucket.
+// |categoryAndName| doesn't need to be a constant string.
+// The format of the string is "category\0name".
+#define TRACE_EVENT_SET_NONCONST_SAMPLING_STATE_FOR_BUCKET(bucket_number, categoryAndName) \
+    TraceEvent::SamplingStateScope<bucket_number>::set(categoryAndName)
+
+// Syntactic sugars for the sampling tracing in the main thread.
+#define TRACE_EVENT_SCOPED_SAMPLING_STATE(category, name) \
+    TRACE_EVENT_SCOPED_SAMPLING_STATE_FOR_BUCKET(0, category, name)
+#define TRACE_EVENT_GET_SAMPLING_STATE() \
+    TRACE_EVENT_GET_SAMPLING_STATE_FOR_BUCKET(0)
+#define TRACE_EVENT_SET_SAMPLING_STATE(category, name) \
+    TRACE_EVENT_SET_SAMPLING_STATE_FOR_BUCKET(0, category, name)
+#define TRACE_EVENT_SET_NONCONST_SAMPLING_STATE(categoryAndName) \
+    TRACE_EVENT_SET_NONCONST_SAMPLING_STATE_FOR_BUCKET(0, categoryAndName)
+
+////////////////////////////////////////////////////////////////////////////////
+// Implementation specific tracing API definitions.
+
+// Get a pointer to the enabled state of the given trace category. Only
+// long-lived literal strings should be given as the category name. The returned
+// pointer can be held permanently in a local static for example. If the
+// unsigned char is non-zero, tracing is enabled. If tracing is enabled,
+// TRACE_EVENT_API_ADD_TRACE_EVENT can be called. It's OK if tracing is disabled
+// between the load of the tracing state and the call to
+// TRACE_EVENT_API_ADD_TRACE_EVENT, because this flag only provides an early out
+// for best performance when tracing is disabled.
+// const unsigned char*
+//     TRACE_EVENT_API_GET_CATEGORY_ENABLED(const char* category_name)
+#define TRACE_EVENT_API_GET_CATEGORY_ENABLED \
+    angle::GetTraceCategoryEnabledFlag
+
+// Add a trace event to the platform tracing system.
+// void TRACE_EVENT_API_ADD_TRACE_EVENT(
+//                    char phase,
+//                    const unsigned char* category_enabled,
+//                    const char* name,
+//                    unsigned long long id,
+//                    int num_args,
+//                    const char** arg_names,
+//                    const unsigned char* arg_types,
+//                    const unsigned long long* arg_values,
+//                    unsigned char flags)
+#define TRACE_EVENT_API_ADD_TRACE_EVENT \
+    angle::AddTraceEvent
+
+////////////////////////////////////////////////////////////////////////////////
+
+// Implementation detail: trace event macros create temporary variables
+// to keep instrumentation overhead low. These macros give each temporary
+// variable a unique name based on the line number to prevent name collissions.
+#define INTERNAL_TRACE_EVENT_UID3(a, b) \
+    trace_event_unique_##a##b
+#define INTERNAL_TRACE_EVENT_UID2(a, b) \
+    INTERNAL_TRACE_EVENT_UID3(a, b)
+#define INTERNALTRACEEVENTUID(name_prefix) \
+    INTERNAL_TRACE_EVENT_UID2(name_prefix, __LINE__)
+
+// Implementation detail: internal macro to create static category.
+#define INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category) \
+    static const unsigned char* INTERNALTRACEEVENTUID(catstatic) = 0; \
+    if (!INTERNALTRACEEVENTUID(catstatic)) \
+      INTERNALTRACEEVENTUID(catstatic) = \
+          TRACE_EVENT_API_GET_CATEGORY_ENABLED(category);
+
+// Implementation detail: internal macro to create static category and add
+// event if the category is enabled.
+#define INTERNAL_TRACE_EVENT_ADD(phase, category, name, flags, ...) \
+    do { \
+        INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category); \
+        if (*INTERNALTRACEEVENTUID(catstatic)) { \
+            gl::TraceEvent::addTraceEvent( \
+                phase, INTERNALTRACEEVENTUID(catstatic), name, \
+                gl::TraceEvent::noEventId, flags, ##__VA_ARGS__); \
+        } \
+    } while (0)
+
+// Implementation detail: internal macro to create static category and add begin
+// event if the category is enabled. Also adds the end event when the scope
+// ends.
+#define INTERNAL_TRACE_EVENT_ADD_SCOPED(category, name, ...) \
+    INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category); \
+    gl::TraceEvent::TraceEndOnScopeClose \
+        INTERNALTRACEEVENTUID(profileScope); \
+    if (*INTERNALTRACEEVENTUID(catstatic)) { \
+      gl::TraceEvent::addTraceEvent( \
+          TRACE_EVENT_PHASE_BEGIN, \
+          INTERNALTRACEEVENTUID(catstatic), \
+          name, gl::TraceEvent::noEventId, \
+          TRACE_EVENT_FLAG_NONE, ##__VA_ARGS__); \
+      INTERNALTRACEEVENTUID(profileScope).initialize( \
+          INTERNALTRACEEVENTUID(catstatic), name); \
+    }
+
+// Implementation detail: internal macro to create static category and add
+// event if the category is enabled.
+#define INTERNAL_TRACE_EVENT_ADD_WITH_ID(phase, category, name, id, flags, \
+                                         ...) \
+    do { \
+        INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category); \
+        if (*INTERNALTRACEEVENTUID(catstatic)) { \
+            unsigned char traceEventFlags = flags | TRACE_EVENT_FLAG_HAS_ID; \
+            gl::TraceEvent::TraceID traceEventTraceID( \
+                id, &traceEventFlags); \
+            gl::TraceEvent::addTraceEvent( \
+                phase, INTERNALTRACEEVENTUID(catstatic), \
+                name, traceEventTraceID.data(), traceEventFlags, \
+                ##__VA_ARGS__); \
+        } \
+    } while (0)
+
+// Notes regarding the following definitions:
+// New values can be added and propagated to third party libraries, but existing
+// definitions must never be changed, because third party libraries may use old
+// definitions.
+
+// Phase indicates the nature of an event entry. E.g. part of a begin/end pair.
+#define TRACE_EVENT_PHASE_BEGIN    ('B')
+#define TRACE_EVENT_PHASE_END      ('E')
+#define TRACE_EVENT_PHASE_INSTANT  ('I')
+#define TRACE_EVENT_PHASE_ASYNC_BEGIN ('S')
+#define TRACE_EVENT_PHASE_ASYNC_STEP  ('T')
+#define TRACE_EVENT_PHASE_ASYNC_END   ('F')
+#define TRACE_EVENT_PHASE_METADATA ('M')
+#define TRACE_EVENT_PHASE_COUNTER  ('C')
+#define TRACE_EVENT_PHASE_SAMPLE  ('P')
+
+// Flags for changing the behavior of TRACE_EVENT_API_ADD_TRACE_EVENT.
+#define TRACE_EVENT_FLAG_NONE        (static_cast<unsigned char>(0))
+#define TRACE_EVENT_FLAG_COPY        (static_cast<unsigned char>(1 << 0))
+#define TRACE_EVENT_FLAG_HAS_ID      (static_cast<unsigned char>(1 << 1))
+#define TRACE_EVENT_FLAG_MANGLE_ID   (static_cast<unsigned char>(1 << 2))
+
+// Type values for identifying types in the TraceValue union.
+#define TRACE_VALUE_TYPE_BOOL         (static_cast<unsigned char>(1))
+#define TRACE_VALUE_TYPE_UINT         (static_cast<unsigned char>(2))
+#define TRACE_VALUE_TYPE_INT          (static_cast<unsigned char>(3))
+#define TRACE_VALUE_TYPE_DOUBLE       (static_cast<unsigned char>(4))
+#define TRACE_VALUE_TYPE_POINTER      (static_cast<unsigned char>(5))
+#define TRACE_VALUE_TYPE_STRING       (static_cast<unsigned char>(6))
+#define TRACE_VALUE_TYPE_COPY_STRING  (static_cast<unsigned char>(7))
+
+
+namespace gl {
+
+namespace TraceEvent {
+
+// Specify these values when the corresponding argument of addTraceEvent is not
+// used.
+const int zeroNumArgs = 0;
+const unsigned long long noEventId = 0;
+
+// TraceID encapsulates an ID that can either be an integer or pointer. Pointers
+// are mangled with the Process ID so that they are unlikely to collide when the
+// same pointer is used on different processes.
+class TraceID {
+public:
+    explicit TraceID(const void* id, unsigned char* flags) :
+        m_data(static_cast<unsigned long long>(reinterpret_cast<uintptr_t>(id)))
+    {
+        *flags |= TRACE_EVENT_FLAG_MANGLE_ID;
+    }
+    explicit TraceID(unsigned long long id, unsigned char* flags) : m_data(id) { (void)flags; }
+    explicit TraceID(unsigned long id, unsigned char* flags) : m_data(id) { (void)flags; }
+    explicit TraceID(unsigned int id, unsigned char* flags) : m_data(id) { (void)flags; }
+    explicit TraceID(unsigned short id, unsigned char* flags) : m_data(id) { (void)flags; }
+    explicit TraceID(unsigned char id, unsigned char* flags) : m_data(id) { (void)flags; }
+    explicit TraceID(long long id, unsigned char* flags) :
+        m_data(static_cast<unsigned long long>(id)) { (void)flags; }
+    explicit TraceID(long id, unsigned char* flags) :
+        m_data(static_cast<unsigned long long>(id)) { (void)flags; }
+    explicit TraceID(int id, unsigned char* flags) :
+        m_data(static_cast<unsigned long long>(id)) { (void)flags; }
+    explicit TraceID(short id, unsigned char* flags) :
+        m_data(static_cast<unsigned long long>(id)) { (void)flags; }
+    explicit TraceID(signed char id, unsigned char* flags) :
+        m_data(static_cast<unsigned long long>(id)) { (void)flags; }
+
+    unsigned long long data() const { return m_data; }
+
+private:
+    unsigned long long m_data;
+};
+
+// Simple union to store various types as unsigned long long.
+union TraceValueUnion {
+    bool m_bool;
+    unsigned long long m_uint;
+    long long m_int;
+    double m_double;
+    const void* m_pointer;
+    const char* m_string;
+};
+
+// Simple container for const char* that should be copied instead of retained.
+class TraceStringWithCopy {
+public:
+    explicit TraceStringWithCopy(const char* str) : m_str(str) { }
+    operator const char* () const { return m_str; }
+private:
+    const char* m_str;
+};
+
+// Define setTraceValue for each allowed type. It stores the type and
+// value in the return arguments. This allows this API to avoid declaring any
+// structures so that it is portable to third_party libraries.
+#define INTERNAL_DECLARE_SET_TRACE_VALUE(actual_type, \
+                                         union_member, \
+                                         value_type_id) \
+    static inline void setTraceValue(actual_type arg, \
+                                     unsigned char* type, \
+                                     unsigned long long* value) { \
+        TraceValueUnion typeValue; \
+        typeValue.union_member = arg; \
+        *type = value_type_id; \
+        *value = typeValue.m_uint; \
+    }
+// Simpler form for int types that can be safely casted.
+#define INTERNAL_DECLARE_SET_TRACE_VALUE_INT(actual_type, \
+                                             value_type_id) \
+    static inline void setTraceValue(actual_type arg, \
+                                     unsigned char* type, \
+                                     unsigned long long* value) { \
+        *type = value_type_id; \
+        *value = static_cast<unsigned long long>(arg); \
+    }
+
+INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned long long, TRACE_VALUE_TYPE_UINT)
+INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned int, TRACE_VALUE_TYPE_UINT)
+INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned short, TRACE_VALUE_TYPE_UINT)
+INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned char, TRACE_VALUE_TYPE_UINT)
+INTERNAL_DECLARE_SET_TRACE_VALUE_INT(long long, TRACE_VALUE_TYPE_INT)
+INTERNAL_DECLARE_SET_TRACE_VALUE_INT(int, TRACE_VALUE_TYPE_INT)
+INTERNAL_DECLARE_SET_TRACE_VALUE_INT(short, TRACE_VALUE_TYPE_INT)
+INTERNAL_DECLARE_SET_TRACE_VALUE_INT(signed char, TRACE_VALUE_TYPE_INT)
+INTERNAL_DECLARE_SET_TRACE_VALUE(bool, m_bool, TRACE_VALUE_TYPE_BOOL)
+INTERNAL_DECLARE_SET_TRACE_VALUE(double, m_double, TRACE_VALUE_TYPE_DOUBLE)
+INTERNAL_DECLARE_SET_TRACE_VALUE(const void*, m_pointer,
+                                 TRACE_VALUE_TYPE_POINTER)
+INTERNAL_DECLARE_SET_TRACE_VALUE(const char*, m_string,
+                                 TRACE_VALUE_TYPE_STRING)
+INTERNAL_DECLARE_SET_TRACE_VALUE(const TraceStringWithCopy&, m_string,
+                                 TRACE_VALUE_TYPE_COPY_STRING)
+
+#undef INTERNAL_DECLARE_SET_TRACE_VALUE
+#undef INTERNAL_DECLARE_SET_TRACE_VALUE_INT
+
+static inline void setTraceValue(const std::string& arg,
+                                 unsigned char* type,
+                                 unsigned long long* value) {
+    TraceValueUnion typeValue;
+    typeValue.m_string = arg.data();
+    *type = TRACE_VALUE_TYPE_COPY_STRING;
+    *value = typeValue.m_uint;
+}
+
+// These addTraceEvent template functions are defined here instead of in the
+// macro, because the arg values could be temporary string objects. In order to
+// store pointers to the internal c_str and pass through to the tracing API, the
+// arg values must live throughout these procedures.
+
+static inline angle::Platform::TraceEventHandle addTraceEvent(
+    char phase,
+    const unsigned char* categoryEnabled,
+    const char* name,
+    unsigned long long id,
+    unsigned char flags) {
+    return TRACE_EVENT_API_ADD_TRACE_EVENT(
+        phase, categoryEnabled, name, id,
+        zeroNumArgs, 0, 0, 0,
+        flags);
+}
+
+template<class ARG1_TYPE>
+static inline angle::Platform::TraceEventHandle addTraceEvent(
+    char phase,
+    const unsigned char* categoryEnabled,
+    const char* name,
+    unsigned long long id,
+    unsigned char flags,
+    const char* arg1Name,
+    const ARG1_TYPE& arg1Val) {
+    const int numArgs = 1;
+    unsigned char argTypes[1];
+    unsigned long long argValues[1];
+    setTraceValue(arg1Val, &argTypes[0], &argValues[0]);
+    return TRACE_EVENT_API_ADD_TRACE_EVENT(
+        phase, categoryEnabled, name, id,
+        numArgs, &arg1Name, argTypes, argValues,
+        flags);
+}
+
+template<class ARG1_TYPE, class ARG2_TYPE>
+static inline angle::Platform::TraceEventHandle addTraceEvent(
+    char phase,
+    const unsigned char* categoryEnabled,
+    const char* name,
+    unsigned long long id,
+    unsigned char flags,
+    const char* arg1Name,
+    const ARG1_TYPE& arg1Val,
+    const char* arg2Name,
+    const ARG2_TYPE& arg2Val) {
+    const int numArgs = 2;
+    const char* argNames[2] = { arg1Name, arg2Name };
+    unsigned char argTypes[2];
+    unsigned long long argValues[2];
+    setTraceValue(arg1Val, &argTypes[0], &argValues[0]);
+    setTraceValue(arg2Val, &argTypes[1], &argValues[1]);
+    return TRACE_EVENT_API_ADD_TRACE_EVENT(
+        phase, categoryEnabled, name, id,
+        numArgs, argNames, argTypes, argValues,
+        flags);
+}
+
+// Used by TRACE_EVENTx macro. Do not use directly.
+class TraceEndOnScopeClose {
+public:
+    // Note: members of m_data intentionally left uninitialized. See initialize.
+    TraceEndOnScopeClose() : m_pdata(0) { }
+    ~TraceEndOnScopeClose()
+    {
+        if (m_pdata)
+            addEventIfEnabled();
+    }
+
+    void initialize(const unsigned char* categoryEnabled,
+                    const char* name)
+    {
+        m_data.categoryEnabled = categoryEnabled;
+        m_data.name = name;
+        m_pdata = &m_data;
+    }
+
+private:
+    // Add the end event if the category is still enabled.
+    void addEventIfEnabled()
+    {
+        // Only called when m_pdata is non-null.
+        if (*m_pdata->categoryEnabled) {
+            TRACE_EVENT_API_ADD_TRACE_EVENT(
+                TRACE_EVENT_PHASE_END,
+                m_pdata->categoryEnabled,
+                m_pdata->name, noEventId,
+                zeroNumArgs, 0, 0, 0,
+                TRACE_EVENT_FLAG_NONE);
+        }
+    }
+
+    // This Data struct workaround is to avoid initializing all the members
+    // in Data during construction of this object, since this object is always
+    // constructed, even when tracing is disabled. If the members of Data were
+    // members of this class instead, compiler warnings occur about potential
+    // uninitialized accesses.
+    struct Data {
+        const unsigned char* categoryEnabled;
+        const char* name;
+    };
+    Data* m_pdata;
+    Data m_data;
+};
+
+} // namespace TraceEvent
+
+} // namespace gl
+
+#endif