Web Animations: Refactor KeyframeEffectModel to work via an InterpolationEffect.

Source/core/animation/Animation.h

Index: Source/core/animation/Animation.h
diff --git a/Source/core/animation/Animation.h b/Source/core/animation/Animation.h
index f360e3c9a57909c5249bf91080146c5a504681ce..aed79ca32944494f0b574a1cd7adedcc00445280 100644
--- a/Source/core/animation/Animation.h
+++ b/Source/core/animation/Animation.h
@@ -66,10 +66,10 @@ public:
 
     virtual bool isAnimation() const OVERRIDE { return true; }
 
-    const AnimationEffect::CompositableValueList* compositableValues() const
+    const Vector<RefPtr<Interpolation> >* activeInterpolations() const
     {
-        ASSERT(m_compositableValues);
-        return m_compositableValues.get();
+        ASSERT(m_activeInterpolations);
+        return m_activeInterpolations.get();
     }
 
     bool affects(CSSPropertyID) const;
@@ -106,7 +106,7 @@ private:
     RefPtrWillBePersistent<AnimationEffect> m_effect;
 
     bool m_activeInAnimationStack;
-    OwnPtr<AnimationEffect::CompositableValueList> m_compositableValues;
+    OwnPtr<Vector<RefPtr<Interpolation> > > m_activeInterpolations;
 
     Priority m_priority;