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

ui/base/animation/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_
+#ifndef UI_BASE_ANIMATION_ANIMATION_CONTAINER_OBSERVER_H_
+#define UI_BASE_ANIMATION_ANIMATION_CONTAINER_OBSERVER_H_
 #pragma once
 
+namespace ui {
+
 class AnimationContainer;
 
 // 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() {}
 };
 
-#endif  // APP_ANIMATION_CONTAINER_OBSERVER_H_
+}  // namespace ui
+
+#endif  // UI_BASE_ANIMATION_ANIMATION_CONTAINER_OBSERVER_H_