Have Frame::animation() return a reference

Source/core/frame/animation/AnimationController.h

 /*
  * Copyright (C) 2007 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 59 matching lines @@
 
     static bool supportsAcceleratedAnimationOfProperty(CSSPropertyID);
 
 private:
     OwnPtr<AnimationControllerPrivate> m_data;
     int m_beginAnimationUpdateCount;
 };
 
 class AnimationUpdateBlock {
 public:
-    AnimationUpdateBlock(AnimationController* animationController)
+    explicit AnimationUpdateBlock(AnimationController* animationController)
         : m_animationController(animationController)
     {
         if (m_animationController)
             m_animationController->beginAnimationUpdate();
     }
 
+    explicit AnimationUpdateBlock(AnimationController& animationController)

[Inactive, 2013/10/21 19:15:10]

I added this constructor taking a reference for convenience.

+        : m_animationController(&animationController)
+    {
+        m_animationController->beginAnimationUpdate();
+    }
+
     ~AnimationUpdateBlock()
     {
         if (m_animationController)
             m_animationController->endAnimationUpdate();
     }
 
     AnimationController* m_animationController;
 };
 
 } // namespace WebCore
 
 #endif // AnimationController_h