Moving platform tracing things into platform/tracing.

third_party/WebKit/Source/platform/tracing/TraceEvent.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 13 matching lines @@
  */
 
 // This header file defines implementation details of how the trace macros in
 // TraceEventCommon.h collect and store trace events. Anything not
 // implementation-specific should go in TraceEventCommon.h instead of here.
 
 #ifndef TraceEvent_h
 #define TraceEvent_h
 
 #include "platform/EventTracer.h"
-#include "platform/TraceEventCommon.h"
+#include "platform/tracing/TraceEventCommon.h"
 
-#include "platform/TracedValue.h"
+#include "platform/tracing/TracedValue.h"
 #include "wtf/Allocator.h"
 #include "wtf/DynamicAnnotations.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/text/CString.h"
 #include <memory>
 
 ////////////////////////////////////////////////////////////////////////////////
 // Implementation specific tracing API definitions.

[haraken, 2016/09/16 07:51:32]

This is clearly out of the scope of this CL, but we should really consider
unifying the implementation with base::trace_event.

[jbroman, 2016/09/16 12:02:11]

FYI, wangxianzhu@ says he intends to do this:
https://groups.google.com/a/chromium.org/d/msg/chromium-dev/CyMqAd0Kld4/VS-qA...

 
 // 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) \
     blink::TraceEvent::TraceStringWithCopy(str)
 
 // 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) \
     blink::TraceEvent::TraceID::ForceMangle(id)
@@ skipping 627 matching lines @@
     const char* m_categoryGroup;
     const char* m_name;
     IDType m_id;
 };
 
 } // namespace TraceEvent
 
 } // namespace blink
 
 #endif