Moved the cross-project parts of trace_event.h to trace_event_common.h

base/trace_event/trace_event.h

Index: base/trace_event/trace_event.h
diff --git a/base/trace_event/trace_event.h b/base/trace_event/trace_event.h
index 8b17adcf5737acd2963e2e0b0df28301ace05b2a..29b22cae8ee7711d3417d58ffd2a3aa4124d2c2b 100644
--- a/base/trace_event/trace_event.h
+++ b/base/trace_event/trace_event.h
@@ -2,197 +2,18 @@
 // 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::trace_event::ConvertableToTraceFormat {
-//    public:
-//     MyData() {}
-//     void AppendAsTraceFormat(std::string* out) const override {
-//       out->append("{\"foo\":1}");
-//     }
-//    private:
-//     ~MyData() override {}
-//     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.
-
 #ifndef BASE_TRACE_EVENT_TRACE_EVENT_H_
 #define BASE_TRACE_EVENT_TRACE_EVENT_H_
 
+// This header file defines implementation details of how the trace macros in
+// trace_event_common.h collect and store trace events. Anything not
+// implementation-specific should go in trace_macros_common.h instead of here.
+
 #include <string>
 
 #include "base/atomicops.h"
 #include "base/time/time.h"
+#include "base/trace_event/trace_event_common.h"
 #include "base/trace_event/trace_event_memory.h"
 #include "base/trace_event/trace_event_system_stats_monitor.h"
 #include "base/trace_event/trace_log.h"
@@ -203,10 +24,6 @@
 #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) \
@@ -217,120 +34,6 @@
 #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_EVENT_WITH_FLOW0(category_group, name, bind_id, flow_flags) \
-  INTERNAL_TRACE_MEMORY(category_group, name) \
-  INTERNAL_TRACE_EVENT_ADD_SCOPED_WITH_FLOW(category_group, name, bind_id, \
-                                            flow_flags)
-#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_EVENT_WITH_FLOW1(category_group, name, bind_id, flow_flags, \
-                               arg1_name, arg1_val) \
-  INTERNAL_TRACE_MEMORY(category_group, name) \
-  INTERNAL_TRACE_EVENT_ADD_SCOPED_WITH_FLOW( \
-      category_group, name, bind_id, flow_flags, 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)
-#define TRACE_EVENT_WITH_FLOW2(category_group, name, bind_id, flow_flags, \
-                               arg1_name, arg1_val, arg2_name, arg2_val) \
-  INTERNAL_TRACE_MEMORY(category_group, name) \
-  INTERNAL_TRACE_EVENT_ADD_SCOPED_WITH_FLOW(category_group, name, bind_id, \
-                                            flow_flags, 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
@@ -357,563 +60,8 @@
     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)
-#define TRACE_EVENT_COPY_BEGIN_WITH_ID_TID_AND_TIMESTAMP2( \
-        category_group, name, id, thread_id, timestamp, arg1_name, arg1_val, \
-        arg2_name, arg2_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, 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_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)
-#define TRACE_EVENT_COPY_END_WITH_ID_TID_AND_TIMESTAMP2( \
-        category_group, name, id, thread_id, timestamp, arg1_name, arg1_val, \
-        arg2_name, arg2_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, 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_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))
-
-// TRACE_EVENT_SAMPLE_* events are injected by the sampling profiler.
-#define TRACE_EVENT_SAMPLE_WITH_TID_AND_TIMESTAMP0(category_group, name,       \
-                                                   thread_id, timestamp)       \
-  INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                          \
-      TRACE_EVENT_PHASE_SAMPLE, category_group, name, 0, thread_id, timestamp, \
-      TRACE_EVENT_FLAG_NONE)
-
-#define TRACE_EVENT_SAMPLE_WITH_TID_AND_TIMESTAMP1(                            \
-    category_group, name, thread_id, timestamp, arg1_name, arg1_val)           \
-  INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                          \
-      TRACE_EVENT_PHASE_SAMPLE, category_group, name, 0, thread_id, timestamp, \
-      TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
-
-#define TRACE_EVENT_SAMPLE_WITH_TID_AND_TIMESTAMP2(category_group, name,       \
-                                                   thread_id, timestamp,       \
-                                                   arg1_name, arg1_val,        \
-                                                   arg2_name, arg2_val)        \
-  INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                          \
-      TRACE_EVENT_PHASE_SAMPLE, category_group, name, 0, thread_id, timestamp, \
-      TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, arg2_name, arg2_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)
-#define TRACE_EVENT_COPY_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_COPY)
-
-// 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)
-
-// Similar to TRACE_EVENT_ASYNC_STEP_INTOx but with a custom |at| timestamp
-// provided.
-#define TRACE_EVENT_ASYNC_STEP_INTO_WITH_TIMESTAMP0(category_group, name, \
-        id, step, timestamp) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
-        TRACE_EVENT_PHASE_ASYNC_STEP_INTO, category_group, name, id, \
-        static_cast<int>(base::PlatformThread::CurrentId()), \
-        timestamp, TRACE_EVENT_FLAG_NONE, "step", step)
-
-// 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.
-// - A pair of NESTABLE_ASYNC_BEGIN event and NESTABLE_ASYNC_END event is
-//   considered as a match if their category_group, name and id 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.
-// - |id| is used to match a child NESTABLE_ASYNC event with its parent
-//   NESTABLE_ASYNC event. Therefore, events in the same nested event tree must
-//   be logged using the same id and category_group.
-//
-// Unmatched NESTABLE_ASYNC_END event will be parsed as an event that starts
-// at the first NESTABLE_ASYNC event of that id, and unmatched
-// NESTABLE_ASYNC_BEGIN event will be parsed as an event that ends at the last
-// NESTABLE_ASYNC event of that id. Corresponding warning messages for
-// unmatched events will be shown in the analysis view.
-
-// Records a single NESTABLE_ASYNC_BEGIN event called "name" immediately, with
-// 0, 1 or 2 associated arguments. If the category is not enabled, then this
-// does nothing.
-#define TRACE_EVENT_NESTABLE_ASYNC_BEGIN0(category_group, name, id) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE)
-#define TRACE_EVENT_NESTABLE_ASYNC_BEGIN1(category_group, name, id, arg1_name, \
-        arg1_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)
-#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 0
-// or 2 associated arguments. If the category is not enabled, then this does
-// nothing.
-#define TRACE_EVENT_NESTABLE_ASYNC_END0(category_group, name, id) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE)
-#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)
-
-#define TRACE_EVENT_COPY_NESTABLE_ASYNC_BEGIN_WITH_TTS2(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_ASYNC_TTS | TRACE_EVENT_FLAG_COPY, \
-        arg1_name, arg1_val, arg2_name, arg2_val)
-#define TRACE_EVENT_COPY_NESTABLE_ASYNC_END_WITH_TTS2(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_ASYNC_TTS | TRACE_EVENT_FLAG_COPY, \
-        arg1_name, arg1_val, arg2_name, arg2_val)
-
-// Similar to TRACE_EVENT_NESTABLE_ASYNC_{BEGIN,END}x but with a custom
-// |timestamp| provided.
-#define TRACE_EVENT_NESTABLE_ASYNC_BEGIN_WITH_TIMESTAMP0(category_group, name, \
-        id, timestamp) \
-  INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
-        TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN, category_group, name, id, \
-        static_cast<int>(base::PlatformThread::CurrentId()), timestamp, \
-        TRACE_EVENT_FLAG_NONE)
-
-#define TRACE_EVENT_NESTABLE_ASYNC_END_WITH_TIMESTAMP0(category_group, name, \
-        id, timestamp) \
-  INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
-        TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, category_group, name, id, \
-        static_cast<int>(base::PlatformThread::CurrentId()), timestamp, \
-        TRACE_EVENT_FLAG_NONE)
-
-// 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_END_BIND_TO_ENCLOSING0(category_group, name, id) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_BIND_TO_ENCLOSING)
-#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_SNAPSHOT_WITH_ID_AND_TIMESTAMP(            \
-    category_group, name, id, timestamp, snapshot)                    \
-  INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                 \
-      TRACE_EVENT_PHASE_SNAPSHOT_OBJECT, category_group, name,        \
-      TRACE_ID_DONT_MANGLE(id),                                       \
-      static_cast<int>(base::PlatformThread::CurrentId()), timestamp, \
-      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 TRACE_EVENT_API_CURRENT_THREAD_ID \
+  static_cast<int>(base::PlatformThread::CurrentId())
 
 #define INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE() \
   UNLIKELY(*INTERNAL_TRACE_EVENT_UID(category_group_enabled) &           \
@@ -921,41 +69,6 @@
             base::trace_event::TraceLog::ENABLED_FOR_EVENT_CALLBACK |    \
             base::trace_event::TraceLog::ENABLED_FOR_ETW_EXPORT))
 
-// 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 explicitly warm up a given category group. This could be useful in
-// cases where we want to initialize a category group before any trace events
-// for that category group is reported. For example, to have a category group
-// always show up in the "record categories" list for manually selecting
-// settings in about://tracing.
-#define TRACE_EVENT_WARMUP_CATEGORY(category_group) \
-  INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group)
-
-// 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.
 
@@ -1172,70 +285,6 @@ TRACE_EVENT_API_CLASS_EXPORT extern \
       } \
     } 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')
-#define TRACE_EVENT_PHASE_MEMORY_DUMP ('v')
-
-// Flags for changing the behavior of TRACE_EVENT_API_ADD_TRACE_EVENT.
-#define TRACE_EVENT_FLAG_NONE         (static_cast<unsigned int>(0))
-#define TRACE_EVENT_FLAG_COPY         (static_cast<unsigned int>(1 << 0))
-#define TRACE_EVENT_FLAG_HAS_ID       (static_cast<unsigned int>(1 << 1))
-#define TRACE_EVENT_FLAG_MANGLE_ID    (static_cast<unsigned int>(1 << 2))
-#define TRACE_EVENT_FLAG_SCOPE_OFFSET (static_cast<unsigned int>(1 << 3))
-#define TRACE_EVENT_FLAG_SCOPE_EXTRA  (static_cast<unsigned int>(1 << 4))
-#define TRACE_EVENT_FLAG_EXPLICIT_TIMESTAMP (static_cast<unsigned int>(1 << 5))
-#define TRACE_EVENT_FLAG_ASYNC_TTS    (static_cast<unsigned int>(1 << 6))
-#define TRACE_EVENT_FLAG_BIND_TO_ENCLOSING (static_cast<unsigned int>(1 << 7))
-#define TRACE_EVENT_FLAG_FLOW_IN      (static_cast<unsigned int>(1 << 8))
-#define TRACE_EVENT_FLAG_FLOW_OUT     (static_cast<unsigned int>(1 << 9))
-#define TRACE_EVENT_FLAG_HAS_CONTEXT_ID (static_cast<unsigned int>(1 << 10))
-
-#define TRACE_EVENT_FLAG_SCOPE_MASK   (static_cast<unsigned int>( \
-    TRACE_EVENT_FLAG_SCOPE_OFFSET | TRACE_EVENT_FLAG_SCOPE_EXTRA))
-
-// 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 {