[DevTools] Add power profiler and power overview in timeline panel.

Source/core/testing/InspectorFrontendClientLocal.h

 /*
  * Copyright (C) 2010 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 42 matching lines @@
     virtual void windowObjectCleared();
 
     virtual void inspectedURLChanged(const String&) OVERRIDE { }
 
     virtual void sendMessageToBackend(const String& message);
 
     virtual void sendMessageToEmbedder(const String&) OVERRIDE { }
 
     virtual bool isUnderTest() { return true; }
 
+    virtual void checkPowerProfileSupportedStatus() { }
+    virtual void startPowerProfile() { }
+    virtual void stopPowerProfile() { }
+    virtual void setPowerProfileResolution(unsigned) { }
+
 private:
     Page* m_frontendPage;
     // TODO(yurys): this ref shouldn't be needed.
     RefPtr<InspectorFrontendHost> m_frontendHost;
     RefPtr<InspectorBackendMessageQueue> m_messageQueue;
 };
 
 } // namespace WebCore
 
 #endif