[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp

 /*
  * Copyright (C) 2008, 2009, 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 19 matching lines @@
 
 #include "bindings/core/v8/WindowProxy.h"
 
 #include <utility>
 
 #include "bindings/core/v8/V8BindingForCore.h"
 #include "bindings/core/v8/V8GCForContextDispose.h"
 #include "core/frame/DOMWindow.h"
 #include "core/frame/Frame.h"
 #include "platform/bindings/V8DOMWrapper.h"
+#include "platform/instrumentation/tracing/TraceEvent.h"

[Yuki, 2017/05/12 15:20:10]

Why do we need this here?

[peria, 2017/05/30 08:25:42]

Done.

 #include "platform/wtf/Assertions.h"
 #include "v8/include/v8.h"
 
 namespace blink {
 
 WindowProxy::~WindowProxy() {
   // clearForClose() or clearForNavigation() must be invoked before destruction
   // starts.
   DCHECK(lifecycle_ != Lifecycle::kContextIsInitialized);
 }
@@ skipping 107 matching lines @@
                                  wrapper)) {
     WrapperTypeInfo::WrapperCreated();
     V8DOMWrapper::SetNativeInfo(isolate_, wrapper, wrapper_type_info, window);
     DCHECK(V8DOMWrapper::HasInternalFieldsSet(wrapper));
   }
   SECURITY_CHECK(ToScriptWrappable(wrapper) == window);
   return wrapper;
 }
 
 }  // namespace blink