Oilpan: Move AnimatableValue's hierarchy to oilpan's heap

Source/core/animation/AnimatableVisibility.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 21 matching lines @@
 #define AnimatableVisibility_h
 
 #include "core/animation/AnimatableValue.h"
 #include "core/rendering/style/RenderStyleConstants.h"
 
 namespace WebCore {
 
 class AnimatableVisibility FINAL : public AnimatableValue {
 public:
     virtual ~AnimatableVisibility() { }
-    static PassRefPtr<AnimatableVisibility> create(EVisibility visibility)
+    static PassRefPtrWillBeRawPtr<AnimatableVisibility> create(EVisibility visibility)
     {
-        return adoptRef(new AnimatableVisibility(visibility));
+        return adoptRefWillBeNoop(new AnimatableVisibility(visibility));
     }
 
     EVisibility visibility() const { return m_visibility; }
 
+    virtual void trace(Visitor*) OVERRIDE { }
+
 protected:
-    virtual PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const OVERRIDE;
+    virtual PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const OVERRIDE;
     virtual bool usesDefaultInterpolationWith(const AnimatableValue*) const OVERRIDE;
 
 private:
     explicit AnimatableVisibility(EVisibility visibility)
         : m_visibility(visibility)
     {
     }
     virtual AnimatableType type() const OVERRIDE { return TypeVisibility; }
     virtual bool equalTo(const AnimatableValue*) const OVERRIDE;
     const EVisibility m_visibility;
 };
 
 DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableVisibility, isVisibility());
 
 } // namespace WebCore
 
 #endif // AnimatableVisibility_h