Move animation code to new ui/base/animation directory....

app/animation_container_observer.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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 APP_ANIMATION_CONTAINER_OBSERVER_H_
 #define APP_ANIMATION_CONTAINER_OBSERVER_H_
 #pragma once
 
-class AnimationContainer;
+#include "ui/base/animation/animation_container_observer.h"
 
-// The observer is notified after every update of the animations managed by
-// the container.
-class AnimationContainerObserver {
- public:
-  // Invoked on every tick of the timer managed by the container and after
-  // all the animations have updated.
-  virtual void AnimationContainerProgressed(
-      AnimationContainer* container) = 0;
-
-  // Invoked when no more animations are being managed by this container.
-  virtual void AnimationContainerEmpty(AnimationContainer* container) = 0;
-
- protected:
-  virtual ~AnimationContainerObserver() {}
-};
+using ui::AnimationContainerObserver;
 
 #endif  // APP_ANIMATION_CONTAINER_OBSERVER_H_