Add foundation for removing AnimatableValues from StyleInterpolation

Source/core/animation/KeyframeEffectModel.cpp

 /*
  * 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 216 matching lines @@
     EffectModel::trace(visitor);
 }
 
 Keyframe::PropertySpecificKeyframe::PropertySpecificKeyframe(double offset, PassRefPtr<TimingFunction> easing, EffectModel::CompositeOperation composite)
     : m_offset(offset)
     , m_easing(easing)
     , m_composite(composite)
 {
 }
 
-void KeyframeEffectModelBase::PropertySpecificKeyframeGroup::appendKeyframe(PassOwnPtrWillBeRawPtr<Keyframe::PropertySpecificKeyframe> keyframe)
+void KeyframeEffectModelBase::PropertySpecificKeyframeGroup::appendKeyframe(PassRefPtrWillBeRawPtr<Keyframe::PropertySpecificKeyframe> keyframe)
 {
     ASSERT(m_keyframes.isEmpty() || m_keyframes.last()->offset() <= keyframe->offset());
     m_keyframes.append(keyframe);
 }
 
 void KeyframeEffectModelBase::PropertySpecificKeyframeGroup::removeRedundantKeyframes()
 {
     // As an optimization, removes keyframes in the following categories, as
     // they will never be used by sample().
     // - End keyframes with the same offset as their neighbor
@@ skipping 30 matching lines @@
 }
 
 DEFINE_TRACE(KeyframeEffectModelBase::PropertySpecificKeyframeGroup)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_keyframes);
 #endif
 }
 
 } // namespace