[Binding] [UMA] Add a UMA to track time spent in WindowProxy::initialize

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 207 matching lines @@
     if (isContextInitialized())
         return true;
 
     return initialize();
 }
 
 bool WindowProxy::initialize()
 {
     TRACE_EVENT0("v8", "WindowProxy::initialize");
     TRACE_EVENT_SCOPED_SAMPLING_STATE("blink", "InitializeWindow");
+    SCOPED_BLINK_UMA_HISTOGRAM_TIMER("Blink.Binding.InitializeWindowProxy");
 
     ScriptForbiddenScope::AllowUserAgentScript allowScript;
 
     v8::HandleScope handleScope(m_isolate);
 
     createContext();
 
     if (!isContextInitialized())
         return false;
 
@@ skipping 314 matching lines @@
 }
 
 void WindowProxy::updateSecurityOrigin(SecurityOrigin* origin)
 {
     if (!isContextInitialized())
         return;
     setSecurityToken(origin);
 }
 
 } // namespace blink