Allows observers to be notified when layer animations complete.

ui/gfx/compositor/layer_animation_observer.h

 // Copyright (c) 2011 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_LAYER_ANIMATOR_DELEGATE_H_
-#define UI_GFX_COMPOSITOR_LAYER_ANIMATOR_DELEGATE_H_
+#ifndef UI_GFX_COMPOSITOR_LAYER_ANIMATION_OBSERVER_H_
+#define UI_GFX_COMPOSITOR_LAYER_ANIMATION_OBSERVER_H_
 #pragma once
 
-#include "ui/gfx/rect.h"
-#include "ui/gfx/transform.h"
 #include "ui/gfx/compositor/compositor_export.h"
-#include "ui/gfx/compositor/layer_animation_delegate.h"
 
 namespace ui {
 
 class LayerAnimationSequence;
 
-// Layer animators interact with the layers using this interface.
-class COMPOSITOR_EXPORT LayerAnimatorDelegate : public LayerAnimationDelegate {
+// LayerAnimationObservers are notified when animations complete.
+class COMPOSITOR_EXPORT LayerAnimationObserver  {
  public:
   // Called when the |sequence| ends. Not called if |sequence| is aborted.
-  virtual void OnLayerAnimationEnded(LayerAnimationSequence* sequence) = 0;
+  virtual void OnLayerAnimationEnded(
+      const LayerAnimationSequence* sequence) = 0;
 
   // if this becomes necessary, this would be the appropriate place to add

[sky, 2011/10/27 19:29:19]

Remove this comment.

   // notifications about elements starting or ending, or sequences starting.
 
  protected:
-  virtual ~LayerAnimatorDelegate() {}
+  virtual ~LayerAnimationObserver() {}
 };
 
 }  // namespace ui
 
-#endif  // UI_GFX_COMPOSITOR_LAYER_ANIMATOR_DELEGATE_H_
+#endif  // UI_GFX_COMPOSITOR_LAYER_ANIMATION_OBSERVER_H_