Add foundation for removing AnimatableValues from StyleInterpolation

Source/core/animation/KeyframeEffectModel.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 38 matching lines @@
 
 namespace blink {
 
 class Element;
 class KeyframeEffectModelTest;
 
 class CORE_EXPORT KeyframeEffectModelBase : public EffectModel {
 public:
     // FIXME: Implement accumulation.
 
-    using PropertySpecificKeyframeVector = WillBeHeapVector<OwnPtrWillBeMember<Keyframe::PropertySpecificKeyframe>>;
+    using PropertySpecificKeyframeVector = WillBeHeapVector<RefPtrWillBeMember<Keyframe::PropertySpecificKeyframe>>;
     class PropertySpecificKeyframeGroup : public NoBaseWillBeGarbageCollected<PropertySpecificKeyframeGroup> {
     public:
-        void appendKeyframe(PassOwnPtrWillBeRawPtr<Keyframe::PropertySpecificKeyframe>);
+        void appendKeyframe(PassRefPtrWillBeRawPtr<Keyframe::PropertySpecificKeyframe>);
         const PropertySpecificKeyframeVector& keyframes() const { return m_keyframes; }
 
         DECLARE_TRACE();
 
     private:
         void removeRedundantKeyframes();
         bool addSyntheticKeyframeIfRequired(PassRefPtr<TimingFunction> neutralKeyframeEasing);
 
         PropertySpecificKeyframeVector m_keyframes;
 
@@ skipping 130 matching lines @@
 
 template <>
 inline bool KeyframeEffectModel<AnimatableValueKeyframe>::isAnimatableValueKeyframeEffectModel() const { return true; }
 
 template <>
 inline bool KeyframeEffectModel<StringKeyframe>::isStringKeyframeEffectModel() const { return true; }
 
 } // namespace blink
 
 #endif // KeyframeEffectModel_h