Surface pushState event

third_party/WebKit/Source/core/frame/History.h

 /*
  * Copyright (C) 2007 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 #ifndef History_h
 #define History_h
 
 #include "base/gtest_prod_util.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "bindings/core/v8/SerializedScriptValue.h"
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/loader/FrameLoaderTypes.h"
 #include "platform/heap/Handle.h"
+#include "platform/instrumentation/tracing/TraceEvent.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class LocalFrame;
 class KURL;
 class ExceptionState;
 class SecurityOrigin;
 class ScriptState;
 
@@ skipping 11 matching lines @@
   SerializedScriptValue* state();
 
   void back(ScriptState*);
   void forward(ScriptState*);
   void go(ScriptState*, int delta);
 
   void pushState(PassRefPtr<SerializedScriptValue> data,
                  const String& title,
                  const String& url,
                  ExceptionState& exceptionState) {
+    TRACE_EVENT0("spa:navigation", "History::pushState");

[tdresser, 2017/01/26 20:01:53]

I think we can just use "blink" as the category.
Let's move this method to the cpp.

     stateObjectAdded(std::move(data), title, url, scrollRestorationInternal(),
                      FrameLoadTypeStandard, exceptionState);
   }
 
   void replaceState(PassRefPtr<SerializedScriptValue> data,
                     const String& title,
                     const String& url,
                     ExceptionState& exceptionState) {
     stateObjectAdded(std::move(data), title, url, scrollRestorationInternal(),
                      FrameLoadTypeReplaceCurrentItem, exceptionState);
@@ skipping 28 matching lines @@
                         ExceptionState&);
   SerializedScriptValue* stateInternal() const;
   HistoryScrollRestorationType scrollRestorationInternal() const;
 
   RefPtr<SerializedScriptValue> m_lastStateObjectRequested;
 };
 
 }  // namespace blink
 
 #endif  // History_h