Add GPU memory usage contents browser test

chrome/browser/automation/testing_automation_provider.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_AUTOMATION_TESTING_AUTOMATION_PROVIDER_H_
 #define CHROME_BROWSER_AUTOMATION_TESTING_AUTOMATION_PROVIDER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 672 matching lines @@
   // Gets statistics about the v8 heap in a renderer process.
   void GetV8HeapStats(Browser* browser,
                       base::DictionaryValue* args,
                       IPC::Message* reply_message);
 
   // Gets the current FPS associated with a renderer process view.
   void GetFPS(Browser* browser,
               base::DictionaryValue* args,
               IPC::Message* reply_message);
 
+  // Gets the current total global GPU memory usage.
+  void GetGpuMemoryUsage(Browser* browser,
+                         base::DictionaryValue* args,
+                         IPC::Message* reply_message);
+
   // Fullscreen and Mouse Lock hooks. They take no JSON parameters.
   void IsFullscreenForBrowser(Browser* browser,
             base::DictionaryValue* args,
             IPC::Message* reply_message);
   void IsFullscreenForTab(Browser* browser,
             base::DictionaryValue* args,
             IPC::Message* reply_message);
   void IsMouseLocked(Browser* browser,
             base::DictionaryValue* args,
             IPC::Message* reply_message);
@@ skipping 895 matching lines @@
   scoped_ptr<AutomationEventQueue> automation_event_queue_;
 
   // List of commands which just finish synchronously and don't require
   // setting up an observer.
   static const int kSynchronousCommands[];
 
   DISALLOW_COPY_AND_ASSIGN(TestingAutomationProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOMATION_TESTING_AUTOMATION_PROVIDER_H_