Make event names of TRACE_EVENT_SAMPLING_STATE macros more descriptive

Source/bindings/v8/V8WindowShell.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 168 matching lines @@
 // the outer window, and the outer window identify is preserved for
 // the frame. However, a new inner window is created for the new page.
 // If there are JS code holds a closure to the old inner window,
 // it won't be able to reach the outer window via its global object.
 bool V8WindowShell::initializeIfNeeded()
 {
     if (m_contextHolder)
         return true;
 
     TRACE_EVENT0("v8", "V8WindowShell::initializeIfNeeded");
+    TRACE_EVENT_SCOPED_SAMPLING_STATE("Blink", "InitializeWindow");
 
     v8::HandleScope handleScope(m_isolate);
 
     createContext();
     if (!m_contextHolder)
         return false;
 
     v8::Handle<v8::Context> context = m_contextHolder->context();
 
     V8PerContextDataHolder::install(context);
@@ skipping 296 matching lines @@
 void V8WindowShell::updateSecurityOrigin(SecurityOrigin* origin)
 {
     ASSERT(m_world->isMainWorld());
     if (!m_contextHolder)
         return;
     v8::HandleScope handleScope(m_isolate);
     setSecurityToken(origin);
 }
 
 } // WebCore