Additional context creation tracing

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "bindings/core/v8/ScriptState.h"
 
 #include "bindings/core/v8/V8Binding.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
+#include "platform/TraceEvent.h"
 
 namespace blink {
 
 PassRefPtr<ScriptState> ScriptState::create(v8::Local<v8::Context> context, PassRefPtr<DOMWrapperWorld> world)
 {
+    TRACE_EVENT0("v8", "ScriptState::create");
     RefPtr<ScriptState> scriptState = adoptRef(new ScriptState(context, world));
     // This ref() is for keeping this ScriptState alive as long as the v8::Context is alive.
     // This is deref()ed in the weak callback of the v8::Context.
     scriptState->ref();
     return scriptState;
 }
 
 static void derefCallback(const v8::WeakCallbackInfo<ScriptState>& data)
 {
     data.GetParameter()->deref();
@@ skipping 76 matching lines @@
     v8::HandleScope handleScope(toIsolate(frame));
     v8::Local<v8::Context> context = toV8Context(frame, world);
     if (context.IsEmpty())
         return nullptr;
     ScriptState* scriptState = ScriptState::from(context);
     ASSERT(scriptState->contextIsValid());
     return scriptState;
 }
 
 } // namespace blink