Replaced BackgroundAnimator with ShelfBackgroundAnimator.

ui/gfx/animation/animation_container.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_ANIMATION_ANIMATION_CONTAINER_H_
 #define UI_GFX_ANIMATION_ANIMATION_CONTAINER_H_
 
 #include <set>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "ui/gfx/gfx_export.h"
 
 namespace gfx {
 
 class AnimationContainerElement;
 class AnimationContainerObserver;
 
 // AnimationContainer is used by Animation to manage the underlying timer.
 // Internally each Animation creates a single AnimationContainer. You can
 // group a set of Animations into the same AnimationContainer by way of
 // Animation::SetContainer. Grouping a set of Animations into the same
 // AnimationContainer ensures they all update and start at the same time.
 //
 // AnimationContainer is ref counted. Each Animation contained within the
 // AnimationContainer own it.
+//
+// TODO(bruthig): Enhance to use the same clock source as |timer_| so that tests
+// can control animations using a SingleThreadTaskRunner test double.
+// (See https://crbug.com/630684)
 class GFX_EXPORT AnimationContainer
     : public base::RefCounted<AnimationContainer> {
  public:
   AnimationContainer();
 
   // Invoked by Animation when it needs to start. Starts the timer if necessary.
   // NOTE: This is invoked by Animation for you, you shouldn't invoke this
   // directly.
   void Start(AnimationContainerElement* animation);
 
@@ skipping 44 matching lines @@
   base::RepeatingTimer timer_;
 
   AnimationContainerObserver* observer_;
 
   DISALLOW_COPY_AND_ASSIGN(AnimationContainer);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_ANIMATION_ANIMATION_CONTAINER_H_