Roll Chrome into Mojo.

base/debug/trace_event.h

 // 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.
 
-// This header file defines the set of trace_event macros without specifying
-// how the events actually get collected and stored. If you need to expose trace
-// events to some other universe, you can copy-and-paste this file as well as
-// trace_event.h, modifying the macros contained there as necessary 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 LOG's
-// categories are statically defined, TRACE categories are created
-// implicitly with a string. For example:
-//   TRACE_EVENT_INSTANT0("MY_SUBSYSTEM", "SomeImportantEvent",
-//                        TRACE_EVENT_SCOPE_THREAD)
-//
-// It is often the case that one trace may belong in multiple categories at the
-// same time. The first argument to the trace can be a comma-separated list of
-// categories, forming a category group, like:
-//
-// TRACE_EVENT_INSTANT0("input,views", "OnMouseOver", TRACE_EVENT_SCOPE_THREAD)
-//
-// We can enable/disable tracing of OnMouseOver by enabling/disabling either
-// category.
-//
-// 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 disambiguate 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_group, name, and arg_names.  Thus, the following code will
-// cause problems:
-//     char* str = strdup("importantName");
-//     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"));
-//
-//
-// Convertable notes:
-// Converting a large data type to a string can be costly. To help with this,
-// the trace framework provides an interface ConvertableToTraceFormat. If you
-// inherit from it and implement the AppendAsTraceFormat method the trace
-// framework will call back to your object to convert a trace output time. This
-// means, if the category for the event is disabled, the conversion will not
-// happen.
-//
-//   class MyData : public base::debug::ConvertableToTraceFormat {
-//    public:
-//     MyData() {}
-//     virtual void AppendAsTraceFormat(std::string* out) const override {
-//       out->append("{\"foo\":1}");
-//     }
-//    private:
-//     virtual ~MyData() {}
-//     DISALLOW_COPY_AND_ASSIGN(MyData);
-//   };
-//
-//   TRACE_EVENT1("foo", "bar", "data",
-//                scoped_refptr<ConvertableToTraceFormat>(new MyData()));
-//
-// The trace framework will take ownership if the passed pointer and it will
-// be free'd when the trace buffer is flushed.
-//
-// Note, we only do the conversion when the buffer is flushed, so the provided
-// data object should not be modified after it's passed to the trace framework.
-//
-//
-// 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_group_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 acquiring a lock
-// and resolving the category.
+// In the process of moving the trace event files. Right now the headers
+// are being forwarded. In next CLs the change will get completed
+// TODO(ssid): https://code.google.com/p/chromium/issues/detail?id=451032
 
 #ifndef BASE_DEBUG_TRACE_EVENT_H_
 #define BASE_DEBUG_TRACE_EVENT_H_
 
-#include <string>
+#include "base/trace_event/trace_event.h"
 
-#include "base/atomicops.h"
-#include "base/debug/trace_event_impl.h"
-#include "base/debug/trace_event_memory.h"
-#include "base/debug/trace_event_system_stats_monitor.h"
-#include "base/time/time.h"
-#include "build/build_config.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) \
-    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) \
-    trace_event_internal::TraceID::ForceMangle(id)
-
-// By default, pointers are mangled with the Process ID in TRACE_EVENT_ASYNC
-// macros. Use this macro to prevent Process ID mangling.
-#define TRACE_ID_DONT_MANGLE(id) \
-    trace_event_internal::TraceID::DontMangle(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_group, name) \
-    INTERNAL_TRACE_MEMORY(category_group, name) \
-    INTERNAL_TRACE_EVENT_ADD_SCOPED(category_group, name)
-#define TRACE_EVENT1(category_group, name, arg1_name, arg1_val) \
-    INTERNAL_TRACE_MEMORY(category_group, name) \
-    INTERNAL_TRACE_EVENT_ADD_SCOPED(category_group, name, arg1_name, arg1_val)
-#define TRACE_EVENT2( \
-    category_group, name, arg1_name, arg1_val, arg2_name, arg2_val) \
-  INTERNAL_TRACE_MEMORY(category_group, name) \
-  INTERNAL_TRACE_EVENT_ADD_SCOPED( \
-      category_group, name, arg1_name, arg1_val, arg2_name, arg2_val)
-
-// Records events like TRACE_EVENT2 but uses |memory_tag| for memory tracing.
-// Use this where |name| is too generic to accurately aggregate allocations.
-#define TRACE_EVENT_WITH_MEMORY_TAG2( \
-    category, name, memory_tag, arg1_name, arg1_val, arg2_name, arg2_val) \
-  INTERNAL_TRACE_MEMORY(category, memory_tag) \
-  INTERNAL_TRACE_EVENT_ADD_SCOPED( \
-      category, name, arg1_name, arg1_val, arg2_name, arg2_val)
-
-// UNSHIPPED_TRACE_EVENT* are like TRACE_EVENT* except that they are not
-// included in official builds.
-
-#if OFFICIAL_BUILD
-#undef TRACING_IS_OFFICIAL_BUILD
-#define TRACING_IS_OFFICIAL_BUILD 1
-#elif !defined(TRACING_IS_OFFICIAL_BUILD)
-#define TRACING_IS_OFFICIAL_BUILD 0
-#endif
-
-#if TRACING_IS_OFFICIAL_BUILD
-#define UNSHIPPED_TRACE_EVENT0(category_group, name) (void)0
-#define UNSHIPPED_TRACE_EVENT1(category_group, name, arg1_name, arg1_val) \
-    (void)0
-#define UNSHIPPED_TRACE_EVENT2(category_group, name, arg1_name, arg1_val, \
-                               arg2_name, arg2_val) (void)0
-#define UNSHIPPED_TRACE_EVENT_INSTANT0(category_group, name, scope) (void)0
-#define UNSHIPPED_TRACE_EVENT_INSTANT1(category_group, name, scope, \
-                                       arg1_name, arg1_val) (void)0
-#define UNSHIPPED_TRACE_EVENT_INSTANT2(category_group, name, scope, \
-                                       arg1_name, arg1_val, \
-                                       arg2_name, arg2_val) (void)0
-#else
-#define UNSHIPPED_TRACE_EVENT0(category_group, name) \
-    TRACE_EVENT0(category_group, name)
-#define UNSHIPPED_TRACE_EVENT1(category_group, name, arg1_name, arg1_val) \
-    TRACE_EVENT1(category_group, name, arg1_name, arg1_val)
-#define UNSHIPPED_TRACE_EVENT2(category_group, name, arg1_name, arg1_val, \
-                               arg2_name, arg2_val) \
-    TRACE_EVENT2(category_group, name, arg1_name, arg1_val, arg2_name, arg2_val)
-#define UNSHIPPED_TRACE_EVENT_INSTANT0(category_group, name, scope) \
-    TRACE_EVENT_INSTANT0(category_group, name, scope)
-#define UNSHIPPED_TRACE_EVENT_INSTANT1(category_group, name, scope, \
-                                       arg1_name, arg1_val) \
-    TRACE_EVENT_INSTANT1(category_group, name, scope, arg1_name, arg1_val)
-#define UNSHIPPED_TRACE_EVENT_INSTANT2(category_group, name, scope, \
-                                       arg1_name, arg1_val, \
-                                       arg2_name, arg2_val) \
-    TRACE_EVENT_INSTANT2(category_group, name, scope, arg1_name, arg1_val, \
-                         arg2_name, arg2_val)
-#endif
-
-// 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_group, name, scope) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
-        category_group, name, TRACE_EVENT_FLAG_NONE | scope)
-#define TRACE_EVENT_INSTANT1(category_group, name, scope, arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
-        category_group, name, TRACE_EVENT_FLAG_NONE | scope, \
-        arg1_name, arg1_val)
-#define TRACE_EVENT_INSTANT2(category_group, name, scope, arg1_name, arg1_val, \
-                             arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
-        category_group, name, TRACE_EVENT_FLAG_NONE | scope, \
-        arg1_name, arg1_val, arg2_name, arg2_val)
-#define TRACE_EVENT_COPY_INSTANT0(category_group, name, scope) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
-        category_group, name, TRACE_EVENT_FLAG_COPY | scope)
-#define TRACE_EVENT_COPY_INSTANT1(category_group, name, scope, \
-                                  arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
-        category_group, name, TRACE_EVENT_FLAG_COPY | scope, arg1_name, \
-        arg1_val)
-#define TRACE_EVENT_COPY_INSTANT2(category_group, name, scope, \
-                                  arg1_name, arg1_val, \
-                                  arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
-        category_group, name, TRACE_EVENT_FLAG_COPY | scope, \
-        arg1_name, arg1_val, arg2_name, arg2_val)
-
-// Sets the current sample state to 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.
-#define TRACE_EVENT_SET_SAMPLING_STATE_FOR_BUCKET( \
-    bucket_number, category, name)                 \
-        trace_event_internal::                     \
-        TraceEventSamplingStateScope<bucket_number>::Set(category "\0" name)
-
-// Returns a current sampling state of the given bucket.
-#define TRACE_EVENT_GET_SAMPLING_STATE_FOR_BUCKET(bucket_number) \
-    trace_event_internal::TraceEventSamplingStateScope<bucket_number>::Current()
-
-// Creates a scope of a sampling state of the given bucket.
-//
-// {  // 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)                                      \
-    trace_event_internal::TraceEventSamplingStateScope<bucket_number>   \
-        traceEventSamplingScope(category "\0" name);
-
-// 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)
-
-
-// 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_group, name) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
-        category_group, name, TRACE_EVENT_FLAG_NONE)
-#define TRACE_EVENT_BEGIN1(category_group, name, arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
-        category_group, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
-#define TRACE_EVENT_BEGIN2(category_group, name, arg1_name, arg1_val, \
-        arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
-        category_group, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \
-        arg2_name, arg2_val)
-#define TRACE_EVENT_COPY_BEGIN0(category_group, name) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
-        category_group, name, TRACE_EVENT_FLAG_COPY)
-#define TRACE_EVENT_COPY_BEGIN1(category_group, name, arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
-        category_group, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val)
-#define TRACE_EVENT_COPY_BEGIN2(category_group, name, arg1_name, arg1_val, \
-        arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
-        category_group, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, \
-        arg2_name, arg2_val)
-
-// Similar to TRACE_EVENT_BEGINx but with a custom |at| timestamp provided.
-// - |id| is used to match the _BEGIN event with the _END event.
-//   Events are considered to match if their category_group, 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.
-#define TRACE_EVENT_BEGIN_WITH_ID_TID_AND_TIMESTAMP0(category_group, \
-        name, id, thread_id, timestamp) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
-        TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id, thread_id, \
-        timestamp, TRACE_EVENT_FLAG_NONE)
-#define TRACE_EVENT_COPY_BEGIN_WITH_ID_TID_AND_TIMESTAMP0( \
-        category_group, name, id, thread_id, timestamp) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
-        TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id, thread_id, \
-        timestamp, TRACE_EVENT_FLAG_COPY)
-#define TRACE_EVENT_COPY_BEGIN_WITH_ID_TID_AND_TIMESTAMP1( \
-        category_group, name, id, thread_id, timestamp, arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
-        TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id, thread_id, \
-        timestamp, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_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_group, name) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
-        category_group, name, TRACE_EVENT_FLAG_NONE)
-#define TRACE_EVENT_END1(category_group, name, arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
-        category_group, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
-#define TRACE_EVENT_END2(category_group, name, arg1_name, arg1_val, \
-        arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
-        category_group, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \
-        arg2_name, arg2_val)
-#define TRACE_EVENT_COPY_END0(category_group, name) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
-        category_group, name, TRACE_EVENT_FLAG_COPY)
-#define TRACE_EVENT_COPY_END1(category_group, name, arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
-        category_group, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val)
-#define TRACE_EVENT_COPY_END2(category_group, name, arg1_name, arg1_val, \
-        arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
-        category_group, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, \
-        arg2_name, arg2_val)
-
-// Similar to TRACE_EVENT_ENDx but with a custom |at| timestamp provided.
-// - |id| is used to match the _BEGIN event with the _END event.
-//   Events are considered to match if their category_group, 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.
-#define TRACE_EVENT_END_WITH_ID_TID_AND_TIMESTAMP0(category_group, \
-        name, id, thread_id, timestamp) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
-        TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id, thread_id, \
-        timestamp, TRACE_EVENT_FLAG_NONE)
-#define TRACE_EVENT_COPY_END_WITH_ID_TID_AND_TIMESTAMP0( \
-        category_group, name, id, thread_id, timestamp) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
-        TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id, thread_id, \
-        timestamp, TRACE_EVENT_FLAG_COPY)
-#define TRACE_EVENT_COPY_END_WITH_ID_TID_AND_TIMESTAMP1( \
-        category_group, name, id, thread_id, timestamp, arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
-        TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id, thread_id, \
-        timestamp, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_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_group, name, value) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \
-        category_group, name, TRACE_EVENT_FLAG_NONE, \
-        "value", static_cast<int>(value))
-#define TRACE_COPY_COUNTER1(category_group, name, value) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \
-        category_group, 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_group, name, value1_name, value1_val, \
-        value2_name, value2_val) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \
-        category_group, name, TRACE_EVENT_FLAG_NONE, \
-        value1_name, static_cast<int>(value1_val), \
-        value2_name, static_cast<int>(value2_val))
-#define TRACE_COPY_COUNTER2(category_group, name, value1_name, value1_val, \
-        value2_name, value2_val) \
-    INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \
-        category_group, 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_group, name, id, value) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, \
-        "value", static_cast<int>(value))
-#define TRACE_COPY_COUNTER_ID1(category_group, name, id, value) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \
-        category_group, 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_group, name, id, value1_name, value1_val, \
-        value2_name, value2_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \
-        category_group, 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_group, name, id, value1_name, \
-        value1_val, value2_name, value2_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \
-        category_group, name, id, TRACE_EVENT_FLAG_COPY, \
-        value1_name, static_cast<int>(value1_val), \
-        value2_name, static_cast<int>(value2_val))
-
-// ASYNC_STEP_* APIs should be only used by legacy code. New code should
-// consider using NESTABLE_ASYNC_* APIs to describe substeps within an async
-// event.
-// 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_group, 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_INTO or ASYNC_STEP_PAST macros. The ASYNC_STEP_INTO macro will
-// annotate the block following the call. The ASYNC_STEP_PAST macro will
-// annotate the block prior to the call. Note that any particular event must use
-// only STEP_INTO or STEP_PAST macros; they can not mix and match. When the
-// operation completes, call ASYNC_END.
-//
-// An ASYNC trace typically occurs 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 step can have its own
-// args.
-#define TRACE_EVENT_ASYNC_BEGIN0(category_group, name, id) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE)
-#define TRACE_EVENT_ASYNC_BEGIN1(category_group, name, id, arg1_name, \
-        arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
-#define TRACE_EVENT_ASYNC_BEGIN2(category_group, name, id, arg1_name, \
-        arg1_val, arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, \
-        arg1_name, arg1_val, arg2_name, arg2_val)
-#define TRACE_EVENT_COPY_ASYNC_BEGIN0(category_group, name, id) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
-        category_group, name, id, TRACE_EVENT_FLAG_COPY)
-#define TRACE_EVENT_COPY_ASYNC_BEGIN1(category_group, name, id, arg1_name, \
-        arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
-        category_group, name, id, TRACE_EVENT_FLAG_COPY, \
-        arg1_name, arg1_val)
-#define TRACE_EVENT_COPY_ASYNC_BEGIN2(category_group, name, id, arg1_name, \
-        arg1_val, arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
-        category_group, name, id, TRACE_EVENT_FLAG_COPY, \
-        arg1_name, arg1_val, arg2_name, arg2_val)
-
-// Similar to TRACE_EVENT_ASYNC_BEGINx but with a custom |at| timestamp
-// provided.
-#define TRACE_EVENT_ASYNC_BEGIN_WITH_TIMESTAMP0(category_group, \
-        name, id, timestamp) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
-        TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id, \
-        static_cast<int>(base::PlatformThread::CurrentId()), \
-        timestamp, TRACE_EVENT_FLAG_NONE)
-
-// Records a single ASYNC_STEP_INTO 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. The ASYNC_BEGIN event must not have any
-// ASYNC_STEP_PAST events.
-#define TRACE_EVENT_ASYNC_STEP_INTO0(category_group, name, id, step) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP_INTO, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, "step", step)
-#define TRACE_EVENT_ASYNC_STEP_INTO1(category_group, name, id, step, \
-                                     arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP_INTO, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, "step", step, \
-        arg1_name, arg1_val)
-
-// Records a single ASYNC_STEP_PAST 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. The ASYNC_BEGIN event must not have any
-// ASYNC_STEP_INTO events.
-#define TRACE_EVENT_ASYNC_STEP_PAST0(category_group, name, id, step) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP_PAST, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, "step", step)
-#define TRACE_EVENT_ASYNC_STEP_PAST1(category_group, name, id, step, \
-                                     arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP_PAST, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, "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_group, name, id) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE)
-#define TRACE_EVENT_ASYNC_END1(category_group, name, id, arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
-#define TRACE_EVENT_ASYNC_END2(category_group, name, id, arg1_name, arg1_val, \
-        arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, \
-        arg1_name, arg1_val, arg2_name, arg2_val)
-#define TRACE_EVENT_COPY_ASYNC_END0(category_group, name, id) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_COPY)
-#define TRACE_EVENT_COPY_ASYNC_END1(category_group, name, id, arg1_name, \
-        arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_COPY, \
-        arg1_name, arg1_val)
-#define TRACE_EVENT_COPY_ASYNC_END2(category_group, name, id, arg1_name, \
-        arg1_val, arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_COPY, \
-        arg1_name, arg1_val, arg2_name, arg2_val)
-
-// Similar to TRACE_EVENT_ASYNC_ENDx but with a custom |at| timestamp provided.
-#define TRACE_EVENT_ASYNC_END_WITH_TIMESTAMP0(category_group, \
-        name, id, timestamp) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
-        TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id, \
-        static_cast<int>(base::PlatformThread::CurrentId()), \
-        timestamp, TRACE_EVENT_FLAG_NONE)
-
-// NESTABLE_ASYNC_* APIs are used to describe an async operation, which can
-// be nested within a NESTABLE_ASYNC event and/or have inner NESTABLE_ASYNC
-// events.
-// - category and name strings must have application lifetime (statics or
-//   literals). They may not include " chars.
-// - |id| is used to match the NESTABLE_ASYNC_BEGIN event with the
-//   NESTABLE_ASYNC_END event. Events are considered to match if their
-//   category_group, 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.
-//
-// Unmatched NESTABLE_ASYNC_END event will be parsed as an instant event,
-// and unmatched NESTABLE_ASYNC_BEGIN event will be parsed as an event that
-// ends at the last NESTABLE_ASYNC_END event of that |id|.
-
-// Records a single NESTABLE_ASYNC_BEGIN event called "name" immediately, with 2
-// associated arguments. If the category is not enabled, then this does nothing.
-#define TRACE_EVENT_NESTABLE_ASYNC_BEGIN2(category_group, name, id, arg1_name, \
-        arg1_val, arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \
-        arg2_name, arg2_val)
-// Records a single NESTABLE_ASYNC_END event called "name" immediately, with 2
-// associated arguments. If the category is not enabled, then this does nothing.
-#define TRACE_EVENT_NESTABLE_ASYNC_END2(category_group, name, id, arg1_name, \
-        arg1_val, arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \
-        arg2_name, arg2_val)
-// Records a single NESTABLE_ASYNC_INSTANT event called "name" immediately,
-// with 2 associated arguments. If the category is not enabled, then this
-// does nothing.
-#define TRACE_EVENT_NESTABLE_ASYNC_INSTANT2(category_group, name, id, \
-        arg1_name, arg1_val, arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_INSTANT, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, 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_group, 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_group, name, id) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE)
-#define TRACE_EVENT_FLOW_BEGIN1(category_group, name, id, arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
-#define TRACE_EVENT_FLOW_BEGIN2(category_group, name, id, arg1_name, arg1_val, \
-        arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, \
-        arg1_name, arg1_val, arg2_name, arg2_val)
-#define TRACE_EVENT_COPY_FLOW_BEGIN0(category_group, name, id) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \
-        category_group, name, id, TRACE_EVENT_FLAG_COPY)
-#define TRACE_EVENT_COPY_FLOW_BEGIN1(category_group, name, id, arg1_name, \
-        arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \
-        category_group, name, id, TRACE_EVENT_FLAG_COPY, \
-        arg1_name, arg1_val)
-#define TRACE_EVENT_COPY_FLOW_BEGIN2(category_group, name, id, arg1_name, \
-        arg1_val, arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \
-        category_group, 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_group, name, id, step) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, "step", step)
-#define TRACE_EVENT_FLOW_STEP1(category_group, name, id, step, \
-        arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, "step", step, \
-        arg1_name, arg1_val)
-#define TRACE_EVENT_COPY_FLOW_STEP0(category_group, name, id, step) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, \
-        category_group, name, id, TRACE_EVENT_FLAG_COPY, "step", step)
-#define TRACE_EVENT_COPY_FLOW_STEP1(category_group, name, id, step, \
-        arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, \
-        category_group, 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_group, name, id) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE)
-#define TRACE_EVENT_FLOW_END1(category_group, name, id, arg1_name, arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
-#define TRACE_EVENT_FLOW_END2(category_group, name, id, arg1_name, arg1_val, \
-        arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, \
-        arg1_name, arg1_val, arg2_name, arg2_val)
-#define TRACE_EVENT_COPY_FLOW_END0(category_group, name, id) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_COPY)
-#define TRACE_EVENT_COPY_FLOW_END1(category_group, name, id, arg1_name, \
-        arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_COPY, \
-        arg1_name, arg1_val)
-#define TRACE_EVENT_COPY_FLOW_END2(category_group, name, id, arg1_name, \
-        arg1_val, arg2_name, arg2_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_COPY, \
-        arg1_name, arg1_val, arg2_name, arg2_val)
-
-// Macros to track the life time and value of arbitrary client objects.
-// See also TraceTrackableObject.
-#define TRACE_EVENT_OBJECT_CREATED_WITH_ID(category_group, name, id) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_CREATE_OBJECT, \
-        category_group, name, TRACE_ID_DONT_MANGLE(id), TRACE_EVENT_FLAG_NONE)
-
-#define TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(category_group, name, id, snapshot) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_SNAPSHOT_OBJECT, \
-        category_group, name, TRACE_ID_DONT_MANGLE(id), TRACE_EVENT_FLAG_NONE,\
-        "snapshot", snapshot)
-
-#define TRACE_EVENT_OBJECT_DELETED_WITH_ID(category_group, name, id) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_DELETE_OBJECT, \
-        category_group, name, TRACE_ID_DONT_MANGLE(id), TRACE_EVENT_FLAG_NONE)
-
-#define INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE() \
-    UNLIKELY(*INTERNAL_TRACE_EVENT_UID(category_group_enabled) & \
-        (base::debug::TraceLog::ENABLED_FOR_RECORDING | \
-         base::debug::TraceLog::ENABLED_FOR_EVENT_CALLBACK))
-
-// Macro to efficiently determine if a given category group is enabled.
-#define TRACE_EVENT_CATEGORY_GROUP_ENABLED(category_group, ret) \
-    do { \
-      INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
-      if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) { \
-        *ret = true; \
-      } else { \
-        *ret = false; \
-      } \
-    } while (0)
-
-// Macro to efficiently determine, through polling, if a new trace has begun.
-#define TRACE_EVENT_IS_NEW_TRACE(ret) \
-    do { \
-      static int INTERNAL_TRACE_EVENT_UID(lastRecordingNumber) = 0; \
-      int num_traces_recorded = TRACE_EVENT_API_GET_NUM_TRACES_RECORDED(); \
-      if (num_traces_recorded != -1 && \
-          num_traces_recorded != \
-          INTERNAL_TRACE_EVENT_UID(lastRecordingNumber)) { \
-        INTERNAL_TRACE_EVENT_UID(lastRecordingNumber) = \
-            num_traces_recorded; \
-        *ret = true; \
-      } else { \
-        *ret = false; \
-      } \
-    } while (0)
-
-////////////////////////////////////////////////////////////////////////////////
-// 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 group. 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_GROUP_ENABLED(const char* category_group)
-#define TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED \
-    base::debug::TraceLog::GetCategoryGroupEnabled
-
-// Get the number of times traces have been recorded. This is used to implement
-// the TRACE_EVENT_IS_NEW_TRACE facility.
-// unsigned int TRACE_EVENT_API_GET_NUM_TRACES_RECORDED()
-#define TRACE_EVENT_API_GET_NUM_TRACES_RECORDED \
-    base::debug::TraceLog::GetInstance()->GetNumTracesRecorded
-
-// Add a trace event to the platform tracing system.
-// base::debug::TraceEventHandle TRACE_EVENT_API_ADD_TRACE_EVENT(
-//                    char phase,
-//                    const unsigned char* category_group_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 \
-    base::debug::TraceLog::GetInstance()->AddTraceEvent
-
-// Add a trace event to the platform tracing system.
-// base::debug::TraceEventHandle TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_TIMESTAMP(
-//                    char phase,
-//                    const unsigned char* category_group_enabled,
-//                    const char* name,
-//                    unsigned long long id,
-//                    int thread_id,
-//                    const TimeTicks& timestamp,
-//                    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_WITH_THREAD_ID_AND_TIMESTAMP \
-    base::debug::TraceLog::GetInstance()->AddTraceEventWithThreadIdAndTimestamp
-
-// Set the duration field of a COMPLETE trace event.
-// void TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(
-//     const unsigned char* category_group_enabled,
-//     const char* name,
-//     base::debug::TraceEventHandle id)
-#define TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION \
-    base::debug::TraceLog::GetInstance()->UpdateTraceEventDuration
-
-// Defines atomic operations used internally by the tracing system.
-#define TRACE_EVENT_API_ATOMIC_WORD base::subtle::AtomicWord
-#define TRACE_EVENT_API_ATOMIC_LOAD(var) base::subtle::NoBarrier_Load(&(var))
-#define TRACE_EVENT_API_ATOMIC_STORE(var, value) \
-    base::subtle::NoBarrier_Store(&(var), (value))
-
-// Defines visibility for classes in trace_event.h
-#define TRACE_EVENT_API_CLASS_EXPORT BASE_EXPORT
-
-// The thread buckets for the sampling profiler.
-TRACE_EVENT_API_CLASS_EXPORT extern \
-    TRACE_EVENT_API_ATOMIC_WORD g_trace_state[3];
-
-#define TRACE_EVENT_API_THREAD_BUCKET(thread_bucket)                           \
-    g_trace_state[thread_bucket]
-
-////////////////////////////////////////////////////////////////////////////////
-
-// 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 collisions.
-#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__)
-
-// Implementation detail: internal macro to create static category.
-// No barriers are needed, because this code is designed to operate safely
-// even when the unsigned char* points to garbage data (which may be the case
-// on processors without cache coherency).
-#define INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO_CUSTOM_VARIABLES( \
-    category_group, atomic, category_group_enabled) \
-    category_group_enabled = \
-        reinterpret_cast<const unsigned char*>(TRACE_EVENT_API_ATOMIC_LOAD( \
-            atomic)); \
-    if (UNLIKELY(!category_group_enabled)) { \
-      category_group_enabled = \
-          TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(category_group); \
-      TRACE_EVENT_API_ATOMIC_STORE(atomic, \
-          reinterpret_cast<TRACE_EVENT_API_ATOMIC_WORD>( \
-              category_group_enabled)); \
-    }
-
-#define INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group) \
-    static TRACE_EVENT_API_ATOMIC_WORD INTERNAL_TRACE_EVENT_UID(atomic) = 0; \
-    const unsigned char* INTERNAL_TRACE_EVENT_UID(category_group_enabled); \
-    INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO_CUSTOM_VARIABLES(category_group, \
-        INTERNAL_TRACE_EVENT_UID(atomic), \
-        INTERNAL_TRACE_EVENT_UID(category_group_enabled));
-
-// Implementation detail: internal macro to create static category and add
-// event if the category is enabled.
-#define INTERNAL_TRACE_EVENT_ADD(phase, category_group, name, flags, ...) \
-    do { \
-      INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
-      if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) { \
-        trace_event_internal::AddTraceEvent( \
-            phase, INTERNAL_TRACE_EVENT_UID(category_group_enabled), name, \
-            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_group, name, ...) \
-    INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
-    trace_event_internal::ScopedTracer INTERNAL_TRACE_EVENT_UID(tracer); \
-    if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) { \
-      base::debug::TraceEventHandle h = trace_event_internal::AddTraceEvent( \
-          TRACE_EVENT_PHASE_COMPLETE, \
-          INTERNAL_TRACE_EVENT_UID(category_group_enabled), \
-          name, trace_event_internal::kNoEventId, \
-          TRACE_EVENT_FLAG_NONE, ##__VA_ARGS__); \
-      INTERNAL_TRACE_EVENT_UID(tracer).Initialize( \
-          INTERNAL_TRACE_EVENT_UID(category_group_enabled), name, h); \
-    }
-
-// 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_group, name, id, \
-                                         flags, ...) \
-    do { \
-      INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
-      if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) { \
-        unsigned char trace_event_flags = flags | TRACE_EVENT_FLAG_HAS_ID; \
-        trace_event_internal::TraceID trace_event_trace_id( \
-            id, &trace_event_flags); \
-        trace_event_internal::AddTraceEvent( \
-            phase, INTERNAL_TRACE_EVENT_UID(category_group_enabled), \
-            name, trace_event_trace_id.data(), trace_event_flags, \
-            ##__VA_ARGS__); \
-      } \
-    } while (0)
-
-// Implementation detail: internal macro to create static category and add
-// event if the category is enabled.
-#define INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(phase, \
-        category_group, name, id, thread_id, timestamp, flags, ...) \
-    do { \
-      INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
-      if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) { \
-        unsigned char trace_event_flags = flags | TRACE_EVENT_FLAG_HAS_ID; \
-        trace_event_internal::TraceID trace_event_trace_id( \
-            id, &trace_event_flags); \
-        trace_event_internal::AddTraceEventWithThreadIdAndTimestamp( \
-            phase, INTERNAL_TRACE_EVENT_UID(category_group_enabled), \
-            name, trace_event_trace_id.data(), \
-            thread_id, base::TimeTicks::FromInternalValue(timestamp), \
-            trace_event_flags, ##__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_COMPLETE ('X')
-#define TRACE_EVENT_PHASE_INSTANT  ('I')
-#define TRACE_EVENT_PHASE_ASYNC_BEGIN ('S')
-#define TRACE_EVENT_PHASE_ASYNC_STEP_INTO  ('T')
-#define TRACE_EVENT_PHASE_ASYNC_STEP_PAST  ('p')
-#define TRACE_EVENT_PHASE_ASYNC_END   ('F')
-#define TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN ('b')
-#define TRACE_EVENT_PHASE_NESTABLE_ASYNC_END ('e')
-#define TRACE_EVENT_PHASE_NESTABLE_ASYNC_INSTANT ('n')
-#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')
-#define TRACE_EVENT_PHASE_SAMPLE  ('P')
-#define TRACE_EVENT_PHASE_CREATE_OBJECT ('N')
-#define TRACE_EVENT_PHASE_SNAPSHOT_OBJECT ('O')
-#define TRACE_EVENT_PHASE_DELETE_OBJECT ('D')
-
-// 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))
-#define TRACE_EVENT_FLAG_SCOPE_OFFSET (static_cast<unsigned char>(1 << 3))
-
-#define TRACE_EVENT_FLAG_SCOPE_MASK   (static_cast<unsigned char>( \
-    TRACE_EVENT_FLAG_SCOPE_OFFSET | (TRACE_EVENT_FLAG_SCOPE_OFFSET << 1)))
-
-// 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))
-#define TRACE_VALUE_TYPE_CONVERTABLE  (static_cast<unsigned char>(8))
-
-// Enum reflecting the scope of an INSTANT event. Must fit within
-// TRACE_EVENT_FLAG_SCOPE_MASK.
-#define TRACE_EVENT_SCOPE_GLOBAL  (static_cast<unsigned char>(0 << 3))
-#define TRACE_EVENT_SCOPE_PROCESS (static_cast<unsigned char>(1 << 3))
-#define TRACE_EVENT_SCOPE_THREAD  (static_cast<unsigned char>(2 << 3))
-
-#define TRACE_EVENT_SCOPE_NAME_GLOBAL  ('g')
-#define TRACE_EVENT_SCOPE_NAME_PROCESS ('p')
-#define TRACE_EVENT_SCOPE_NAME_THREAD  ('t')
-
-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 by default 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 DontMangle {
-   public:
-    explicit DontMangle(const void* id)
-        : data_(static_cast<unsigned long long>(
-              reinterpret_cast<uintptr_t>(id))) {}
-    explicit DontMangle(unsigned long long id) : data_(id) {}
-    explicit DontMangle(unsigned long id) : data_(id) {}
-    explicit DontMangle(unsigned int id) : data_(id) {}
-    explicit DontMangle(unsigned short id) : data_(id) {}
-    explicit DontMangle(unsigned char id) : data_(id) {}
-    explicit DontMangle(long long id)
-        : data_(static_cast<unsigned long long>(id)) {}
-    explicit DontMangle(long id)
-        : data_(static_cast<unsigned long long>(id)) {}
-    explicit DontMangle(int id)
-        : data_(static_cast<unsigned long long>(id)) {}
-    explicit DontMangle(short id)
-        : data_(static_cast<unsigned long long>(id)) {}
-    explicit DontMangle(signed char id)
-        : data_(static_cast<unsigned long long>(id)) {}
-    unsigned long long data() const { return data_; }
-   private:
-    unsigned long long data_;
-  };
-
-  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_;
-  };
-  TraceID(const void* id, unsigned char* flags)
-      : data_(static_cast<unsigned long long>(
-              reinterpret_cast<uintptr_t>(id))) {
-    *flags |= TRACE_EVENT_FLAG_MANGLE_ID;
-  }
-  TraceID(ForceMangle id, unsigned char* flags) : data_(id.data()) {
-    *flags |= TRACE_EVENT_FLAG_MANGLE_ID;
-  }
-  TraceID(DontMangle id, unsigned char* flags) : data_(id.data()) {
-  }
-  TraceID(unsigned long long id, unsigned char* flags)
-      : data_(id) { (void)flags; }
-  TraceID(unsigned long id, unsigned char* flags)
-      : data_(id) { (void)flags; }
-  TraceID(unsigned int id, unsigned char* flags)
-      : data_(id) { (void)flags; }
-  TraceID(unsigned short id, unsigned char* flags)
-      : data_(id) { (void)flags; }
-  TraceID(unsigned char id, unsigned char* flags)
-      : data_(id) { (void)flags; }
-  TraceID(long long id, unsigned char* flags)
-      : data_(static_cast<unsigned long long>(id)) { (void)flags; }
-  TraceID(long id, unsigned char* flags)
-      : data_(static_cast<unsigned long long>(id)) { (void)flags; }
-  TraceID(int id, unsigned char* flags)
-      : data_(static_cast<unsigned long long>(id)) { (void)flags; }
-  TraceID(short id, unsigned char* flags)
-      : data_(static_cast<unsigned long long>(id)) { (void)flags; }
-  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) {}
-  const char* str() 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, \
-                                         arg_expression, \
-                                         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_expression; \
-      *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, arg, as_bool, TRACE_VALUE_TYPE_BOOL)
-INTERNAL_DECLARE_SET_TRACE_VALUE(double, arg, as_double,
-                                 TRACE_VALUE_TYPE_DOUBLE)
-INTERNAL_DECLARE_SET_TRACE_VALUE(const void*, arg, as_pointer,
-                                 TRACE_VALUE_TYPE_POINTER)
-INTERNAL_DECLARE_SET_TRACE_VALUE(const char*, arg, as_string,
-                                 TRACE_VALUE_TYPE_STRING)
-INTERNAL_DECLARE_SET_TRACE_VALUE(const TraceStringWithCopy&, arg.str(),
-                                 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;
-}
-
-// base::Time and base::TimeTicks version of SetTraceValue to make it easier to
-// trace these types.
-static inline void SetTraceValue(const base::Time arg,
-                                 unsigned char* type,
-                                 unsigned long long* value) {
-  *type = TRACE_VALUE_TYPE_INT;
-  *value = arg.ToInternalValue();
-}
-
-static inline void SetTraceValue(const base::TimeTicks arg,
-                                 unsigned char* type,
-                                 unsigned long long* value) {
-  *type = TRACE_VALUE_TYPE_INT;
-  *value = arg.ToInternalValue();
-}
-
-// These AddTraceEvent and AddTraceEventWithThreadIdAndTimestamp 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 base::debug::TraceEventHandle
-AddTraceEventWithThreadIdAndTimestamp(
-    char phase,
-    const unsigned char* category_group_enabled,
-    const char* name,
-    unsigned long long id,
-    int thread_id,
-    const base::TimeTicks& timestamp,
-    unsigned char flags,
-    const char* arg1_name,
-    const scoped_refptr<base::debug::ConvertableToTraceFormat>& arg1_val) {
-  const int num_args = 1;
-  unsigned char arg_types[1] = { TRACE_VALUE_TYPE_CONVERTABLE };
-  return TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_THREAD_ID_AND_TIMESTAMP(
-      phase, category_group_enabled, name, id, thread_id, timestamp,
-      num_args, &arg1_name, arg_types, NULL, &arg1_val, flags);
-}
-
-template<class ARG1_TYPE>
-static inline base::debug::TraceEventHandle
-AddTraceEventWithThreadIdAndTimestamp(
-    char phase,
-    const unsigned char* category_group_enabled,
-    const char* name,
-    unsigned long long id,
-    int thread_id,
-    const base::TimeTicks& timestamp,
-    unsigned char flags,
-    const char* arg1_name,
-    const ARG1_TYPE& arg1_val,
-    const char* arg2_name,
-    const scoped_refptr<base::debug::ConvertableToTraceFormat>& 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]);
-  arg_types[1] = TRACE_VALUE_TYPE_CONVERTABLE;
-
-  scoped_refptr<base::debug::ConvertableToTraceFormat> convertable_values[2];
-  convertable_values[1] = arg2_val;
-
-  return TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_THREAD_ID_AND_TIMESTAMP(
-      phase, category_group_enabled, name, id, thread_id, timestamp,
-      num_args, arg_names, arg_types, arg_values, convertable_values, flags);
-}
-
-template<class ARG2_TYPE>
-static inline base::debug::TraceEventHandle
-AddTraceEventWithThreadIdAndTimestamp(
-    char phase,
-    const unsigned char* category_group_enabled,
-    const char* name,
-    unsigned long long id,
-    int thread_id,
-    const base::TimeTicks& timestamp,
-    unsigned char flags,
-    const char* arg1_name,
-    const scoped_refptr<base::debug::ConvertableToTraceFormat>& 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];
-  arg_types[0] = TRACE_VALUE_TYPE_CONVERTABLE;
-  arg_values[0] = 0;
-  SetTraceValue(arg2_val, &arg_types[1], &arg_values[1]);
-
-  scoped_refptr<base::debug::ConvertableToTraceFormat> convertable_values[2];
-  convertable_values[0] = arg1_val;
-
-  return TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_THREAD_ID_AND_TIMESTAMP(
-      phase, category_group_enabled, name, id, thread_id, timestamp,
-      num_args, arg_names, arg_types, arg_values, convertable_values, flags);
-}
-
-static inline base::debug::TraceEventHandle
-AddTraceEventWithThreadIdAndTimestamp(
-    char phase,
-    const unsigned char* category_group_enabled,
-    const char* name,
-    unsigned long long id,
-    int thread_id,
-    const base::TimeTicks& timestamp,
-    unsigned char flags,
-    const char* arg1_name,
-    const scoped_refptr<base::debug::ConvertableToTraceFormat>& arg1_val,
-    const char* arg2_name,
-    const scoped_refptr<base::debug::ConvertableToTraceFormat>& arg2_val) {
-  const int num_args = 2;
-  const char* arg_names[2] = { arg1_name, arg2_name };
-  unsigned char arg_types[2] =
-      { TRACE_VALUE_TYPE_CONVERTABLE, TRACE_VALUE_TYPE_CONVERTABLE };
-  scoped_refptr<base::debug::ConvertableToTraceFormat> convertable_values[2] =
-      { arg1_val, arg2_val };
-
-  return TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_THREAD_ID_AND_TIMESTAMP(
-      phase, category_group_enabled, name, id, thread_id, timestamp,
-      num_args, arg_names, arg_types, NULL, convertable_values, flags);
-}
-
-static inline base::debug::TraceEventHandle
-AddTraceEventWithThreadIdAndTimestamp(
-    char phase,
-    const unsigned char* category_group_enabled,
-    const char* name,
-    unsigned long long id,
-    int thread_id,
-    const base::TimeTicks& timestamp,
-    unsigned char flags) {
-  return TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_THREAD_ID_AND_TIMESTAMP(
-      phase, category_group_enabled, name, id, thread_id, timestamp,
-      kZeroNumArgs, NULL, NULL, NULL, NULL, flags);
-}
-
-static inline base::debug::TraceEventHandle AddTraceEvent(
-    char phase,
-    const unsigned char* category_group_enabled,
-    const char* name,
-    unsigned long long id,
-    unsigned char flags) {
-  int thread_id = static_cast<int>(base::PlatformThread::CurrentId());
-  base::TimeTicks now = base::TimeTicks::NowFromSystemTraceTime();
-  return AddTraceEventWithThreadIdAndTimestamp(phase, category_group_enabled,
-                                               name, id, thread_id, now, flags);
-}
-
-template<class ARG1_TYPE>
-static inline base::debug::TraceEventHandle
-AddTraceEventWithThreadIdAndTimestamp(
-    char phase,
-    const unsigned char* category_group_enabled,
-    const char* name,
-    unsigned long long id,
-    int thread_id,
-    const base::TimeTicks& timestamp,
-    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]);
-  return TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_THREAD_ID_AND_TIMESTAMP(
-      phase, category_group_enabled, name, id, thread_id, timestamp,
-      num_args, &arg1_name, arg_types, arg_values, NULL, flags);
-}
-
-template<class ARG1_TYPE>
-static inline base::debug::TraceEventHandle AddTraceEvent(
-    char phase,
-    const unsigned char* category_group_enabled,
-    const char* name,
-    unsigned long long id,
-    unsigned char flags,
-    const char* arg1_name,
-    const ARG1_TYPE& arg1_val) {
-  int thread_id = static_cast<int>(base::PlatformThread::CurrentId());
-  base::TimeTicks now = base::TimeTicks::NowFromSystemTraceTime();
-  return AddTraceEventWithThreadIdAndTimestamp(phase, category_group_enabled,
-                                               name, id, thread_id, now, flags,
-                                               arg1_name, arg1_val);
-}
-
-template<class ARG1_TYPE, class ARG2_TYPE>
-static inline base::debug::TraceEventHandle
-AddTraceEventWithThreadIdAndTimestamp(
-    char phase,
-    const unsigned char* category_group_enabled,
-    const char* name,
-    unsigned long long id,
-    int thread_id,
-    const base::TimeTicks& timestamp,
-    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]);
-  return TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_THREAD_ID_AND_TIMESTAMP(
-      phase, category_group_enabled, name, id, thread_id, timestamp,
-      num_args, arg_names, arg_types, arg_values, NULL, flags);
-}
-
-template<class ARG1_TYPE, class ARG2_TYPE>
-static inline base::debug::TraceEventHandle AddTraceEvent(
-    char phase,
-    const unsigned char* category_group_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) {
-  int thread_id = static_cast<int>(base::PlatformThread::CurrentId());
-  base::TimeTicks now = base::TimeTicks::NowFromSystemTraceTime();
-  return AddTraceEventWithThreadIdAndTimestamp(phase, category_group_enabled,
-                                               name, id, thread_id, now, flags,
-                                               arg1_name, arg1_val,
-                                               arg2_name, arg2_val);
-}
-
-// Used by TRACE_EVENTx macros. Do not use directly.
-class TRACE_EVENT_API_CLASS_EXPORT ScopedTracer {
- public:
-  // Note: members of data_ intentionally left uninitialized. See Initialize.
-  ScopedTracer() : p_data_(NULL) {}
-
-  ~ScopedTracer() {
-    if (p_data_ && *data_.category_group_enabled)
-      TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(
-          data_.category_group_enabled, data_.name, data_.event_handle);
-  }
-
-  void Initialize(const unsigned char* category_group_enabled,
-                  const char* name,
-                  base::debug::TraceEventHandle event_handle) {
-    data_.category_group_enabled = category_group_enabled;
-    data_.name = name;
-    data_.event_handle = event_handle;
-    p_data_ = &data_;
-  }
-
- private:
-  // 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_group_enabled;
-    const char* name;
-    base::debug::TraceEventHandle event_handle;
-  };
-  Data* p_data_;
-  Data data_;
-};
-
-// Used by TRACE_EVENT_BINARY_EFFICIENTx macro. Do not use directly.
-class TRACE_EVENT_API_CLASS_EXPORT ScopedTraceBinaryEfficient {
- public:
-  ScopedTraceBinaryEfficient(const char* category_group, const char* name);
-  ~ScopedTraceBinaryEfficient();
-
- private:
-  const unsigned char* category_group_enabled_;
-  const char* name_;
-  base::debug::TraceEventHandle event_handle_;
-};
-
-// This macro generates less code then TRACE_EVENT0 but is also
-// slower to execute when tracing is off. It should generally only be
-// used with code that is seldom executed or conditionally executed
-// when debugging.
-// For now the category_group must be "gpu".
-#define TRACE_EVENT_BINARY_EFFICIENT0(category_group, name) \
-    trace_event_internal::ScopedTraceBinaryEfficient \
-        INTERNAL_TRACE_EVENT_UID(scoped_trace)(category_group, name);
-
-// TraceEventSamplingStateScope records the current sampling state
-// and sets a new sampling state. When the scope exists, it restores
-// the sampling state having recorded.
-template<size_t BucketNumber>
-class TraceEventSamplingStateScope {
- public:
-  TraceEventSamplingStateScope(const char* category_and_name) {
-    previous_state_ = TraceEventSamplingStateScope<BucketNumber>::Current();
-    TraceEventSamplingStateScope<BucketNumber>::Set(category_and_name);
-  }
-
-  ~TraceEventSamplingStateScope() {
-    TraceEventSamplingStateScope<BucketNumber>::Set(previous_state_);
-  }
-
-  static inline const char* Current() {
-    return reinterpret_cast<const char*>(TRACE_EVENT_API_ATOMIC_LOAD(
-      g_trace_state[BucketNumber]));
-  }
-
-  static inline void Set(const char* category_and_name) {
-    TRACE_EVENT_API_ATOMIC_STORE(
-      g_trace_state[BucketNumber],
-      reinterpret_cast<TRACE_EVENT_API_ATOMIC_WORD>(
-        const_cast<char*>(category_and_name)));
-  }
-
- private:
-  const char* previous_state_;
-};
-
-}  // namespace trace_event_internal
-
-namespace base {
-namespace debug {
-
-template<typename IDType> class TraceScopedTrackableObject {
- public:
-  TraceScopedTrackableObject(const char* category_group, const char* name,
-      IDType id)
-    : category_group_(category_group),
-      name_(name),
-      id_(id) {
-    TRACE_EVENT_OBJECT_CREATED_WITH_ID(category_group_, name_, id_);
-  }
-
-  template <typename ArgType> void snapshot(ArgType snapshot) {
-    TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(category_group_, name_, id_, snapshot);
-  }
-
-  ~TraceScopedTrackableObject() {
-    TRACE_EVENT_OBJECT_DELETED_WITH_ID(category_group_, name_, id_);
-  }
-
- private:
-  const char* category_group_;
-  const char* name_;
-  IDType id_;
-
-  DISALLOW_COPY_AND_ASSIGN(TraceScopedTrackableObject);
-};
-
-} // namespace debug
-} // namespace base
-
-#endif /* BASE_DEBUG_TRACE_EVENT_H_ */
+#endif  // BASE_DEBUG_TRACE_EVENT_H_