Support per property CSS Animation stacks

Source/core/animation/AnimationStack.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 25 matching lines @@
 #include "core/animation/EffectModel.h"
 #include "core/animation/KeyframeEffect.h"
 #include "core/animation/PropertyHandle.h"
 #include "core/animation/SampledEffect.h"
 #include "platform/geometry/FloatBox.h"
 #include "wtf/HashSet.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
-using ActiveInterpolationMap = HashMap<PropertyHandle, RefPtr<Interpolation>>;
+using ActiveInterpolationsMap = HashMap<PropertyHandle, ActiveInterpolations>;
 
 class InertEffect;
 
 class CORE_EXPORT AnimationStack {
     DISALLOW_ALLOCATION();
     WTF_MAKE_NONCOPYABLE(AnimationStack);
 public:
     AnimationStack();
 
     void add(SampledEffect* effect) { m_effects.append(effect); }
     bool isEmpty() const { return m_effects.isEmpty(); }
     bool hasActiveAnimationsOnCompositor(CSSPropertyID) const;
-    static ActiveInterpolationMap activeInterpolations(AnimationStack*, const HeapVector<Member<InertEffect>>* newAnimations, const HeapHashSet<Member<const Animation>>* suppressedAnimations, KeyframeEffect::Priority, double timelineCurrentTime);
+    static ActiveInterpolationsMap activeInterpolations(AnimationStack*, const HeapVector<Member<InertEffect>>* newAnimations, const HeapHashSet<Member<const Animation>>* suppressedAnimations, KeyframeEffect::Priority, double timelineCurrentTime);
 
     bool getAnimatedBoundingBox(FloatBox&, CSSPropertyID) const;
     DECLARE_TRACE();
 
 private:
     void removeClearedEffects();
 
     // Effects sorted by priority. Lower priority at the start of the list.
     HeapVector<Member<SampledEffect>> m_effects;
 
     friend class AnimationAnimationStackTest;
 };
 
 } // namespace blink
 
 #endif // AnimationStack_h