Update animation when changes in animation keyframes are detected.

Source/core/animation/Animation.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 48 matching lines @@
     static PassRefPtrWillBeRawPtr<Animation> create(Element*, const Vector<Dictionary>& keyframeDictionaryVector, double duration, ExceptionState&);
     static PassRefPtrWillBeRawPtr<Animation> create(Element*, const Vector<Dictionary>& keyframeDictionaryVector, ExceptionState&);
 
     virtual ~Animation();
 
     virtual bool isAnimation() const override { return true; }
 
     bool affects(CSSPropertyID) const;
     const AnimationEffect* effect() const { return m_effect.get(); }
     AnimationEffect* effect() { return m_effect.get(); }
+    void setEffect(PassRefPtrWillBeRawPtr<AnimationEffect> effect) { m_effect = effect; }
     Priority priority() const { return m_priority; }
     Element* target() const { return m_target; }
 
     void notifySampledEffectRemovedFromAnimationStack();
 #if !ENABLE(OILPAN)
     void notifyElementDestroyed();
 #endif
 
     bool isCandidateForAnimationOnCompositor(double playerPlaybackRate) const;
     // Must only be called once.
@@ skipping 28 matching lines @@
     Vector<int> m_compositorAnimationIds;
 
     friend class AnimationAnimationV8Test;
 };
 
 DEFINE_TYPE_CASTS(Animation, AnimationNode, animationNode, animationNode->isAnimation(), animationNode.isAnimation());
 
 } // namespace blink
 
 #endif // Animation_h