Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1060 insertions, 0 deletions

diff --git a/tools/profiler/public/GeckoTraceEvent.h b/tools/profiler/public/GeckoTraceEvent.h
new file mode 100644
index 0000000000..75affaf9c8
--- /dev/null
+++ b/tools/profiler/public/GeckoTraceEvent.h
@@ -0,0 +1,1060 @@
+// Copyright (c) 2012 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 under third_party_mods/chromium or at:
+// http://src.chromium.org/svn/trunk/src/LICENSE
+
+#ifndef GECKO_TRACE_EVENT_H_
+#define GECKO_TRACE_EVENT_H_
+
+#include "MicroGeckoProfiler.h"
+
+// Extracted from Chromium's src/base/debug/trace_event.h, modified to talk to
+// the Gecko profiler.
+
+#if defined(RTC_DISABLE_TRACE_EVENTS)
+#  define RTC_TRACE_EVENTS_ENABLED 0
+#else
+#  define RTC_TRACE_EVENTS_ENABLED 1
+#endif
+
+// 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))
+
+#if RTC_TRACE_EVENTS_ENABLED
+
+// This header is designed to give you trace_event macros without specifying
+// how the events actually get collected and stored. If you need to expose trace
+// event to some other universe, you can copy-and-paste this file,
+// implement the TRACE_EVENT_API macros, and do any other necessary fixup for
+// the target platform. The end result is that multiple libraries can funnel
+// events through to a shared trace event collector.
+
+// 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 RTC_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:
+// Thread safety is provided by methods defined in event_tracer.h. See the file
+// for details.
+
+// 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) \
+    webrtc::trace_event_internal::TraceStringWithCopy(str)
+
+// This will mark the trace event as disabled by default. The user will need
+// to explicitly enable the event.
+#  define TRACE_DISABLED_BY_DEFAULT(name) "disabled-by-default-" name
+
+// By default, uint64 ID argument values are not mangled with the Process ID in
+// TRACE_EVENT_ASYNC macros. Use this macro to force Process ID mangling.
+#  define TRACE_ID_MANGLE(id) \
+    webrtc::trace_event_internal::TraceID::ForceMangle(id)
+
+// 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 macros. When the operation completes, call ASYNC_END.
+// An ASYNC trace typically occur on a single thread (if not, they will only be
+// drawn on the thread defined in the ASYNC_BEGIN event), 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)
+
+// Records a single FLOW_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 FLOW_BEGIN event with the FLOW_END event. FLOW
+//   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.
+// FLOW events are different from ASYNC events in how they are drawn by the
+// tracing UI. A FLOW defines asynchronous data flow, such as posting a task
+// (FLOW_BEGIN) and later executing that task (FLOW_END). Expect FLOWs to be
+// drawn as lines or arrows from FLOW_BEGIN scopes to FLOW_END scopes. Similar
+// to ASYNC, a FLOW can consist of multiple phases. The first phase is defined
+// by the FLOW_BEGIN calls. Additional phases can be defined using the FLOW_STEP
+// macros. When the operation completes, call FLOW_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_FLOW_BEGIN0(category, name, id)                        \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, category, \
+                                     name, id, TRACE_EVENT_FLAG_NONE)
+#  define TRACE_EVENT_FLOW_BEGIN1(category, name, id, arg1_name, arg1_val)   \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, category, \
+                                     name, id, TRACE_EVENT_FLAG_NONE,        \
+                                     arg1_name, arg1_val)
+#  define TRACE_EVENT_FLOW_BEGIN2(category, name, id, arg1_name, arg1_val,   \
+                                  arg2_name, arg2_val)                       \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, category, \
+                                     name, id, TRACE_EVENT_FLAG_NONE,        \
+                                     arg1_name, arg1_val, arg2_name, arg2_val)
+#  define TRACE_EVENT_COPY_FLOW_BEGIN0(category, name, id)                   \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, category, \
+                                     name, id, TRACE_EVENT_FLAG_COPY)
+#  define TRACE_EVENT_COPY_FLOW_BEGIN1(category, name, id, arg1_name,        \
+                                       arg1_val)                             \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, category, \
+                                     name, id, TRACE_EVENT_FLAG_COPY,        \
+                                     arg1_name, arg1_val)
+#  define TRACE_EVENT_COPY_FLOW_BEGIN2(category, name, id, arg1_name,        \
+                                       arg1_val, arg2_name, arg2_val)        \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, category, \
+                                     name, id, TRACE_EVENT_FLAG_COPY,        \
+                                     arg1_name, arg1_val, arg2_name, arg2_val)
+
+// Records a single FLOW_STEP event for `step` immediately. If the category
+// is not enabled, then this does nothing. The `name` and `id` must match the
+// FLOW_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_FLOW_STEP0(category, name, id, step)                    \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, category,   \
+                                     name, id, TRACE_EVENT_FLAG_NONE, "step", \
+                                     step)
+#  define TRACE_EVENT_FLOW_STEP1(category, name, id, step, arg1_name,         \
+                                 arg1_val)                                    \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, category,   \
+                                     name, id, TRACE_EVENT_FLAG_NONE, "step", \
+                                     step, arg1_name, arg1_val)
+#  define TRACE_EVENT_COPY_FLOW_STEP0(category, name, id, step)               \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, category,   \
+                                     name, id, TRACE_EVENT_FLAG_COPY, "step", \
+                                     step)
+#  define TRACE_EVENT_COPY_FLOW_STEP1(category, name, id, step, arg1_name,    \
+                                      arg1_val)                               \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, category,   \
+                                     name, id, TRACE_EVENT_FLAG_COPY, "step", \
+                                     step, arg1_name, arg1_val)
+
+// Records a single FLOW_END event for "name" immediately. If the category
+// is not enabled, then this does nothing.
+#  define TRACE_EVENT_FLOW_END0(category, name, id)                        \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, category, \
+                                     name, id, TRACE_EVENT_FLAG_NONE)
+#  define TRACE_EVENT_FLOW_END1(category, name, id, arg1_name, arg1_val)   \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, category, \
+                                     name, id, TRACE_EVENT_FLAG_NONE,      \
+                                     arg1_name, arg1_val)
+#  define TRACE_EVENT_FLOW_END2(category, name, id, arg1_name, arg1_val,   \
+                                arg2_name, arg2_val)                       \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, category, \
+                                     name, id, TRACE_EVENT_FLAG_NONE,      \
+                                     arg1_name, arg1_val, arg2_name, arg2_val)
+#  define TRACE_EVENT_COPY_FLOW_END0(category, name, id)                   \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, category, \
+                                     name, id, TRACE_EVENT_FLAG_COPY)
+#  define TRACE_EVENT_COPY_FLOW_END1(category, name, id, arg1_name, arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, category,    \
+                                     name, id, TRACE_EVENT_FLAG_COPY,         \
+                                     arg1_name, arg1_val)
+#  define TRACE_EVENT_COPY_FLOW_END2(category, name, id, arg1_name, arg1_val, \
+                                     arg2_name, arg2_val)                     \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, category,    \
+                                     name, id, TRACE_EVENT_FLAG_COPY,         \
+                                     arg1_name, arg1_val, arg2_name, arg2_val)
+
+////////////////////////////////////////////////////////////////////////////////
+// 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 \
+    webrtc::EventTracer::GetCategoryEnabled
+
+// 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 MOZ_INTERNAL_UPROFILER_SIMPLE_EVENT
+
+////////////////////////////////////////////////////////////////////////////////
+
+// 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 INTERNAL_TRACE_EVENT_UID(name_prefix) \
+    INTERNAL_TRACE_EVENT_UID2(name_prefix, __LINE__)
+
+#  if WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS
+#    define INTERNAL_TRACE_EVENT_INFO_TYPE const unsigned char*
+#  else
+#    define INTERNAL_TRACE_EVENT_INFO_TYPE static const unsigned char*
+#  endif  // WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS
+
+// Implementation detail: internal macro to create static category.
+#  define INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category)               \
+    INTERNAL_TRACE_EVENT_INFO_TYPE INTERNAL_TRACE_EVENT_UID(catstatic) = \
+        reinterpret_cast<const unsigned char*>(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 (*INTERNAL_TRACE_EVENT_UID(catstatic)) {                            \
+        webrtc::trace_event_internal::AddTraceEvent(                         \
+            phase, INTERNAL_TRACE_EVENT_UID(catstatic), name,                \
+            webrtc::trace_event_internal::kNoEventId, 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);                         \
+    webrtc::trace_event_internal::TraceEndOnScopeClose                        \
+        INTERNAL_TRACE_EVENT_UID(profileScope);                               \
+    if (*INTERNAL_TRACE_EVENT_UID(catstatic)) {                               \
+      webrtc::trace_event_internal::AddTraceEvent(                            \
+          TRACE_EVENT_PHASE_BEGIN, INTERNAL_TRACE_EVENT_UID(catstatic), name, \
+          webrtc::trace_event_internal::kNoEventId, TRACE_EVENT_FLAG_NONE,    \
+          ##__VA_ARGS__);                                                     \
+      INTERNAL_TRACE_EVENT_UID(profileScope)                                  \
+          .Initialize(INTERNAL_TRACE_EVENT_UID(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 (*INTERNAL_TRACE_EVENT_UID(catstatic)) {                            \
+        unsigned char trace_event_flags = flags | TRACE_EVENT_FLAG_HAS_ID;   \
+        webrtc::trace_event_internal::TraceID trace_event_trace_id(          \
+            id, &trace_event_flags);                                         \
+        webrtc::trace_event_internal::AddTraceEvent(                         \
+            phase, INTERNAL_TRACE_EVENT_UID(catstatic), name,                \
+            trace_event_trace_id.data(), trace_event_flags, ##__VA_ARGS__);  \
+      }                                                                      \
+    } while (0)
+
+#  ifdef MOZ_GECKO_PROFILER
+#    define MOZ_INTERNAL_UPROFILER_SIMPLE_EVENT(phase, category_enabled, name, \
+                                                id, num_args, arg_names,       \
+                                                arg_types, arg_values, flags)  \
+      uprofiler_simple_event_marker(name, phase, num_args, arg_names,          \
+                                    arg_types, arg_values);
+#  else
+#    define MOZ_INTERNAL_UPROFILER_SIMPLE_EVENT(phase, category_enabled, name, \
+                                                id, num_args, arg_names,       \
+                                                arg_types, arg_values, flags)
+#  endif
+
+// 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_FLOW_BEGIN ('s')
+#  define TRACE_EVENT_PHASE_FLOW_STEP ('t')
+#  define TRACE_EVENT_PHASE_FLOW_END ('f')
+#  define TRACE_EVENT_PHASE_METADATA ('M')
+#  define TRACE_EVENT_PHASE_COUNTER ('C')
+
+// 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))
+
+namespace webrtc {
+namespace trace_event_internal {
+
+// Specify these values when the corresponding argument of AddTraceEvent is not
+// used.
+const int kZeroNumArgs = 0;
+const unsigned long long kNoEventId = 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:
+  class ForceMangle {
+   public:
+    explicit ForceMangle(unsigned long long id) : data_(id) {}
+    explicit ForceMangle(unsigned long id) : data_(id) {}
+    explicit ForceMangle(unsigned int id) : data_(id) {}
+    explicit ForceMangle(unsigned short id) : data_(id) {}
+    explicit ForceMangle(unsigned char id) : data_(id) {}
+    explicit ForceMangle(long long id)
+        : data_(static_cast<unsigned long long>(id)) {}
+    explicit ForceMangle(long id)
+        : data_(static_cast<unsigned long long>(id)) {}
+    explicit ForceMangle(int id) : data_(static_cast<unsigned long long>(id)) {}
+    explicit ForceMangle(short id)
+        : data_(static_cast<unsigned long long>(id)) {}
+    explicit ForceMangle(signed char id)
+        : data_(static_cast<unsigned long long>(id)) {}
+
+    unsigned long long data() const { return data_; }
+
+   private:
+    unsigned long long data_;
+  };
+
+  explicit TraceID(const void* id, unsigned char* flags)
+      : data_(
+            static_cast<unsigned long long>(reinterpret_cast<uintptr_t>(id))) {
+    *flags |= TRACE_EVENT_FLAG_MANGLE_ID;
+  }
+  explicit TraceID(ForceMangle id, unsigned char* flags) : data_(id.data()) {
+    *flags |= TRACE_EVENT_FLAG_MANGLE_ID;
+  }
+  explicit TraceID(unsigned long long id, unsigned char* flags) : data_(id) {
+    (void)flags;
+  }
+  explicit TraceID(unsigned long id, unsigned char* flags) : data_(id) {
+    (void)flags;
+  }
+  explicit TraceID(unsigned int id, unsigned char* flags) : data_(id) {
+    (void)flags;
+  }
+  explicit TraceID(unsigned short id, unsigned char* flags) : data_(id) {
+    (void)flags;
+  }
+  explicit TraceID(unsigned char id, unsigned char* flags) : data_(id) {
+    (void)flags;
+  }
+  explicit TraceID(long long id, unsigned char* flags)
+      : data_(static_cast<unsigned long long>(id)) {
+    (void)flags;
+  }
+  explicit TraceID(long id, unsigned char* flags)
+      : data_(static_cast<unsigned long long>(id)) {
+    (void)flags;
+  }
+  explicit TraceID(int id, unsigned char* flags)
+      : data_(static_cast<unsigned long long>(id)) {
+    (void)flags;
+  }
+  explicit TraceID(short id, unsigned char* flags)
+      : data_(static_cast<unsigned long long>(id)) {
+    (void)flags;
+  }
+  explicit TraceID(signed char id, unsigned char* flags)
+      : data_(static_cast<unsigned long long>(id)) {
+    (void)flags;
+  }
+
+  unsigned long long data() const { return data_; }
+
+ private:
+  unsigned long long data_;
+};
+
+// Simple union to store various types as unsigned long long.
+union TraceValueUnion {
+  bool as_bool;
+  unsigned long long as_uint;
+  long long as_int;
+  double as_double;
+  const void* as_pointer;
+  const char* as_string;
+};
+
+// Simple container for const char* that should be copied instead of retained.
+class TraceStringWithCopy {
+ public:
+  explicit TraceStringWithCopy(const char* str) : str_(str) {}
+  operator const char*() const { return str_; }
+
+ private:
+  const char* 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 type_value;                                          \
+      type_value.union_member = arg;                                       \
+      *type = value_type_id;                                               \
+      *value = type_value.as_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 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(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, as_bool, TRACE_VALUE_TYPE_BOOL)
+INTERNAL_DECLARE_SET_TRACE_VALUE(double, as_double, TRACE_VALUE_TYPE_DOUBLE)
+INTERNAL_DECLARE_SET_TRACE_VALUE(const void*, as_pointer,
+                                 TRACE_VALUE_TYPE_POINTER)
+INTERNAL_DECLARE_SET_TRACE_VALUE(const char*, as_string,
+                                 TRACE_VALUE_TYPE_STRING)
+INTERNAL_DECLARE_SET_TRACE_VALUE(const TraceStringWithCopy&, as_string,
+                                 TRACE_VALUE_TYPE_COPY_STRING)
+
+#  undef INTERNAL_DECLARE_SET_TRACE_VALUE
+#  undef INTERNAL_DECLARE_SET_TRACE_VALUE_INT
+
+// std::string version of SetTraceValue so that trace arguments can be strings.
+static inline void SetTraceValue(const std::string& arg, unsigned char* type,
+                                 unsigned long long* value) {
+  TraceValueUnion type_value;
+  type_value.as_string = arg.c_str();
+  *type = TRACE_VALUE_TYPE_COPY_STRING;
+  *value = type_value.as_uint;
+}
+
+// These AddTraceEvent template functions are defined here instead of in the
+// macro, because the arg_values could be temporary objects, such as
+// std::string. 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 void AddTraceEvent(char phase,
+                                 const unsigned char* category_enabled,
+                                 const char* name, unsigned long long id,
+                                 unsigned char flags) {
+  TRACE_EVENT_API_ADD_TRACE_EVENT(phase, category_enabled, name, id,
+                                  kZeroNumArgs, nullptr, nullptr, nullptr,
+                                  flags);
+}
+
+template <class ARG1_TYPE>
+static inline void AddTraceEvent(char phase,
+                                 const unsigned char* category_enabled,
+                                 const char* name, unsigned long long id,
+                                 unsigned char flags, const char* arg1_name,
+                                 const ARG1_TYPE& arg1_val) {
+  const int num_args = 1;
+  unsigned char arg_types[1];
+  unsigned long long arg_values[1];
+  SetTraceValue(arg1_val, &arg_types[0], &arg_values[0]);
+  TRACE_EVENT_API_ADD_TRACE_EVENT(phase, category_enabled, name, id, num_args,
+                                  &arg1_name, arg_types, arg_values, flags);
+}
+
+template <class ARG1_TYPE, class ARG2_TYPE>
+static inline void AddTraceEvent(char phase,
+                                 const unsigned char* category_enabled,
+                                 const char* name, unsigned long long id,
+                                 unsigned char flags, const char* arg1_name,
+                                 const ARG1_TYPE& arg1_val,
+                                 const char* arg2_name,
+                                 const ARG2_TYPE& arg2_val) {
+  const int num_args = 2;
+  const char* arg_names[2] = {arg1_name, arg2_name};
+  unsigned char arg_types[2];
+  unsigned long long arg_values[2];
+  SetTraceValue(arg1_val, &arg_types[0], &arg_values[0]);
+  SetTraceValue(arg2_val, &arg_types[1], &arg_values[1]);
+  TRACE_EVENT_API_ADD_TRACE_EVENT(phase, category_enabled, name, id, num_args,
+                                  arg_names, arg_types, arg_values, flags);
+}
+
+// Used by TRACE_EVENTx macro. Do not use directly.
+class TraceEndOnScopeClose {
+ public:
+  // Note: members of data_ intentionally left uninitialized. See Initialize.
+  TraceEndOnScopeClose() : p_data_(nullptr) {}
+  ~TraceEndOnScopeClose() {
+    if (p_data_) AddEventIfEnabled();
+  }
+
+  void Initialize(const unsigned char* category_enabled, const char* name) {
+    data_.category_enabled = category_enabled;
+    data_.name = name;
+    p_data_ = &data_;
+  }
+
+ private:
+  // Add the end event if the category is still enabled.
+  void AddEventIfEnabled() {
+    // Only called when p_data_ is non-null.
+    if (*p_data_->category_enabled) {
+      TRACE_EVENT_API_ADD_TRACE_EVENT(TRACE_EVENT_PHASE_END,
+                                      p_data_->category_enabled, p_data_->name,
+                                      kNoEventId, kZeroNumArgs, nullptr,
+                                      nullptr, nullptr, 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* category_enabled;
+    const char* name;
+  };
+  Data* p_data_;
+  Data data_;
+};
+
+}  // namespace trace_event_internal
+}  // namespace webrtc
+#else
+
+////////////////////////////////////////////////////////////////////////////////
+// This section defines no-op alternatives to the tracing macros when
+// RTC_DISABLE_TRACE_EVENTS is defined.
+
+#  define RTC_NOOP() \
+    do {             \
+    } while (0)
+
+#  define TRACE_STR_COPY(str) RTC_NOOP()
+
+#  define TRACE_DISABLED_BY_DEFAULT(name) "disabled-by-default-" name
+
+#  define TRACE_ID_MANGLE(id) 0
+
+#  define TRACE_EVENT0(category, name) RTC_NOOP()
+#  define TRACE_EVENT1(category, name, arg1_name, arg1_val) RTC_NOOP()
+#  define TRACE_EVENT2(category, name, arg1_name, arg1_val, arg2_name, \
+                       arg2_val)                                       \
+    RTC_NOOP()
+
+#  define TRACE_EVENT_INSTANT0(category, name) RTC_NOOP()
+#  define TRACE_EVENT_INSTANT1(category, name, arg1_name, arg1_val) RTC_NOOP()
+
+#  define TRACE_EVENT_INSTANT2(category, name, arg1_name, arg1_val, arg2_name, \
+                               arg2_val)                                       \
+    RTC_NOOP()
+
+#  define TRACE_EVENT_COPY_INSTANT0(category, name) RTC_NOOP()
+#  define TRACE_EVENT_COPY_INSTANT1(category, name, arg1_name, arg1_val) \
+    RTC_NOOP()
+#  define TRACE_EVENT_COPY_INSTANT2(category, name, arg1_name, arg1_val, \
+                                    arg2_name, arg2_val)                 \
+    RTC_NOOP()
+
+#  define TRACE_EVENT_BEGIN0(category, name) RTC_NOOP()
+#  define TRACE_EVENT_BEGIN1(category, name, arg1_name, arg1_val) RTC_NOOP()
+#  define TRACE_EVENT_BEGIN2(category, name, arg1_name, arg1_val, arg2_name, \
+                             arg2_val)                                       \
+    RTC_NOOP()
+#  define TRACE_EVENT_COPY_BEGIN0(category, name) RTC_NOOP()
+#  define TRACE_EVENT_COPY_BEGIN1(category, name, arg1_name, arg1_val) \
+    RTC_NOOP()
+#  define TRACE_EVENT_COPY_BEGIN2(category, name, arg1_name, arg1_val, \
+                                  arg2_name, arg2_val)                 \
+    RTC_NOOP()
+
+#  define TRACE_EVENT_END0(category, name) RTC_NOOP()
+#  define TRACE_EVENT_END1(category, name, arg1_name, arg1_val) RTC_NOOP()
+#  define TRACE_EVENT_END2(category, name, arg1_name, arg1_val, arg2_name, \
+                           arg2_val)                                       \
+    RTC_NOOP()
+#  define TRACE_EVENT_COPY_END0(category, name) RTC_NOOP()
+#  define TRACE_EVENT_COPY_END1(category, name, arg1_name, arg1_val) RTC_NOOP()
+#  define TRACE_EVENT_COPY_END2(category, name, arg1_name, arg1_val, \
+                                arg2_name, arg2_val)                 \
+    RTC_NOOP()
+
+#  define TRACE_COUNTER1(category, name, value) RTC_NOOP()
+#  define TRACE_COPY_COUNTER1(category, name, value) RTC_NOOP()
+
+#  define TRACE_COUNTER2(category, name, value1_name, value1_val, value2_name, \
+                         value2_val)                                           \
+    RTC_NOOP()
+#  define TRACE_COPY_COUNTER2(category, name, value1_name, value1_val, \
+                              value2_name, value2_val)                 \
+    RTC_NOOP()
+
+#  define TRACE_COUNTER_ID1(category, name, id, value) RTC_NOOP()
+#  define TRACE_COPY_COUNTER_ID1(category, name, id, value) RTC_NOOP()
+
+#  define TRACE_COUNTER_ID2(category, name, id, value1_name, value1_val, \
+                            value2_name, value2_val)                     \
+    RTC_NOOP()
+#  define TRACE_COPY_COUNTER_ID2(category, name, id, value1_name, value1_val, \
+                                 value2_name, value2_val)                     \
+    RTC_NOOP()
+
+#  define TRACE_EVENT_ASYNC_BEGIN0(category, name, id) RTC_NOOP()
+#  define TRACE_EVENT_ASYNC_BEGIN1(category, name, id, arg1_name, arg1_val) \
+    RTC_NOOP()
+#  define TRACE_EVENT_ASYNC_BEGIN2(category, name, id, arg1_name, arg1_val, \
+                                   arg2_name, arg2_val)                     \
+    RTC_NOOP()
+#  define TRACE_EVENT_COPY_ASYNC_BEGIN0(category, name, id) RTC_NOOP()
+#  define TRACE_EVENT_COPY_ASYNC_BEGIN1(category, name, id, arg1_name, \
+                                        arg1_val)                      \
+    RTC_NOOP()
+#  define TRACE_EVENT_COPY_ASYNC_BEGIN2(category, name, id, arg1_name, \
+                                        arg1_val, arg2_name, arg2_val) \
+    RTC_NOOP()
+
+#  define TRACE_EVENT_ASYNC_STEP0(category, name, id, step) RTC_NOOP()
+#  define TRACE_EVENT_ASYNC_STEP1(category, name, id, step, arg1_name, \
+                                  arg1_val)                            \
+    RTC_NOOP()
+#  define TRACE_EVENT_COPY_ASYNC_STEP0(category, name, id, step) RTC_NOOP()
+#  define TRACE_EVENT_COPY_ASYNC_STEP1(category, name, id, step, arg1_name, \
+                                       arg1_val)                            \
+    RTC_NOOP()
+
+#  define TRACE_EVENT_ASYNC_END0(category, name, id) RTC_NOOP()
+#  define TRACE_EVENT_ASYNC_END1(category, name, id, arg1_name, arg1_val) \
+    RTC_NOOP()
+#  define TRACE_EVENT_ASYNC_END2(category, name, id, arg1_name, arg1_val, \
+                                 arg2_name, arg2_val)                     \
+    RTC_NOOP()
+#  define TRACE_EVENT_COPY_ASYNC_END0(category, name, id) RTC_NOOP()
+#  define TRACE_EVENT_COPY_ASYNC_END1(category, name, id, arg1_name, arg1_val) \
+    RTC_NOOP()
+#  define TRACE_EVENT_COPY_ASYNC_END2(category, name, id, arg1_name, arg1_val, \
+                                      arg2_name, arg2_val)                     \
+    RTC_NOOP()
+
+#  define TRACE_EVENT_FLOW_BEGIN0(category, name, id) RTC_NOOP()
+#  define TRACE_EVENT_FLOW_BEGIN1(category, name, id, arg1_name, arg1_val) \
+    RTC_NOOP()
+#  define TRACE_EVENT_FLOW_BEGIN2(category, name, id, arg1_name, arg1_val, \
+                                  arg2_name, arg2_val)                     \
+    RTC_NOOP()
+#  define TRACE_EVENT_COPY_FLOW_BEGIN0(category, name, id) RTC_NOOP()
+#  define TRACE_EVENT_COPY_FLOW_BEGIN1(category, name, id, arg1_name, \
+                                       arg1_val)                      \
+    RTC_NOOP()
+#  define TRACE_EVENT_COPY_FLOW_BEGIN2(category, name, id, arg1_name, \
+                                       arg1_val, arg2_name, arg2_val) \
+    RTC_NOOP()
+
+#  define TRACE_EVENT_FLOW_STEP0(category, name, id, step) RTC_NOOP()
+#  define TRACE_EVENT_FLOW_STEP1(category, name, id, step, arg1_name, \
+                                 arg1_val)                            \
+    RTC_NOOP()
+#  define TRACE_EVENT_COPY_FLOW_STEP0(category, name, id, step) RTC_NOOP()
+#  define TRACE_EVENT_COPY_FLOW_STEP1(category, name, id, step, arg1_name, \
+                                      arg1_val)                            \
+    RTC_NOOP()
+
+#  define TRACE_EVENT_FLOW_END0(category, name, id) RTC_NOOP()
+#  define TRACE_EVENT_FLOW_END1(category, name, id, arg1_name, arg1_val) \
+    RTC_NOOP()
+#  define TRACE_EVENT_FLOW_END2(category, name, id, arg1_name, arg1_val, \
+                                arg2_name, arg2_val)                     \
+    RTC_NOOP()
+#  define TRACE_EVENT_COPY_FLOW_END0(category, name, id) RTC_NOOP()
+#  define TRACE_EVENT_COPY_FLOW_END1(category, name, id, arg1_name, arg1_val) \
+    RTC_NOOP()
+#  define TRACE_EVENT_COPY_FLOW_END2(category, name, id, arg1_name, arg1_val, \
+                                     arg2_name, arg2_val)                     \
+    RTC_NOOP()
+
+#  define TRACE_EVENT_API_GET_CATEGORY_ENABLED ""
+
+#  define TRACE_EVENT_API_ADD_TRACE_EVENT RTC_NOOP()
+
+#endif  // RTC_TRACE_EVENTS_ENABLED
+
+#endif  // GECKO_TRACE_EVENT_H_