ui: Move compositor/ directory out of gfx/, up to ui/.

ui/compositor/compositor_observer.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 UI_GFX_COMPOSITOR_COMPOSITOR_OBSERVER_H_
-#define UI_GFX_COMPOSITOR_COMPOSITOR_OBSERVER_H_
+#ifndef UI_COMPOSITOR_COMPOSITOR_OBSERVER_H_
+#define UI_COMPOSITOR_COMPOSITOR_OBSERVER_H_
 #pragma once
 
-#include "ui/gfx/compositor/compositor_export.h"
+#include "ui/compositor/compositor_export.h"
 
 namespace ui {
 
 class Compositor;
 
 // A compositor observer is notified when compositing completes.
 class COMPOSITOR_EXPORT CompositorObserver {
  public:
   // Called when compositing started: it has taken all the layer changes into
   // account and has issued the graphics commands.
   virtual void OnCompositingStarted(Compositor* compositor) = 0;
 
   // Called when compositing completes: the present to screen has completed.
   virtual void OnCompositingEnded(Compositor* compositor) = 0;
 
  protected:
   virtual ~CompositorObserver() {}
 };
 
 } // namespace ui
 
-#endif // UI_GFX_COMPOSITOR_COMPOSITOR_OBSERVER_H_
+#endif  // UI_COMPOSITOR_COMPOSITOR_OBSERVER_H_