Web Animations CSS: Implement CSS Transitions backed on Web Animations model

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 32 matching lines @@
 
 public:
     static PassRefPtr<Animation> create(PassRefPtr<Element>, PassRefPtr<AnimationEffect>, const Timing&, PassOwnPtr<EventDelegate> = nullptr);
 
     const AnimationEffect::CompositableValueMap* compositableValues() const
     {
         ASSERT(m_compositableValues);
         return m_compositableValues.get();
     }
 
+    const AnimationEffect* effect() const { return m_effect.get(); }
+
 protected:
     virtual void applyEffects(bool previouslyInEffect);
     virtual void clearEffects();
     virtual void updateChildrenAndEffects(bool) const OVERRIDE FINAL;
     virtual void willDetach() OVERRIDE FINAL;
 
 private:
     Animation(PassRefPtr<Element>, PassRefPtr<AnimationEffect>, const Timing&, PassOwnPtr<EventDelegate>);
 
     RefPtr<Element> m_target;
     RefPtr<AnimationEffect> m_effect;
 
     bool m_activeInAnimationStack;
     OwnPtr<AnimationEffect::CompositableValueMap> m_compositableValues;
 };
 
 } // namespace WebCore
 
 #endif