[tracing] Use trace event profiling for heap profiling

third_party/WebKit/Source/platform/EventTracer.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 78 matching lines @@
         unsigned long long id,
         unsigned long long bindId,
         double timestamp,
         int numArgs,
         const char* argNames[],
         const unsigned char argTypes[],
         const unsigned long long argValues[],
         unsigned flags);
     static void updateTraceEventDuration(const unsigned char* categoryEnabledFlag, const char* name, TraceEvent::TraceEventHandle);
     static double systemTraceTime();
+    static void pushPseudoStackFrame(const char* stackFrame);
+    static void popPseudoStackFrame(const char* stackFrame);
 
 private:
     static TraceEvent::TraceEventHandle addTraceEvent(char phase,
         const unsigned char* categoryEnabledFlag,
         const char* name,
         const char* scope,
         unsigned long long id,
         unsigned long long bindId,
         double timestamp,
         int numArgs,
         const char* argNames[],
         const unsigned char argTypes[],
         const unsigned long long argValues[],
         scoped_ptr<base::trace_event::ConvertableToTraceFormat>* convertables,
         unsigned flags);
 };
 
 } // namespace blink
 
 #endif // EventTracer_h