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

Source/core/animation/AnimatableShadow.cpp

Index: Source/core/animation/AnimatableShadow.cpp
diff --git a/Source/core/animation/AnimatableShadow.cpp b/Source/core/animation/AnimatableShadow.cpp
index 4d1a847f319b7de819d8fe25a3f461aac6b45a53..0d109f803e5307ae02d4dc8781eb420cf20c6b38 100644
--- a/Source/core/animation/AnimatableShadow.cpp
+++ b/Source/core/animation/AnimatableShadow.cpp
@@ -33,13 +33,13 @@
 
 namespace WebCore {
 
-PassRefPtr<AnimatableValue> AnimatableShadow::interpolateTo(const AnimatableValue* value, double fraction) const
+PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableShadow::interpolateTo(const AnimatableValue* value, double fraction) const
 {
     const AnimatableShadow* shadowList = toAnimatableShadow(value);
     return AnimatableShadow::create(ShadowList::blend(m_shadowList.get(), shadowList->m_shadowList.get(), fraction));
 }
 
-PassRefPtr<AnimatableValue> AnimatableShadow::addWith(const AnimatableValue* value) const
+PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableShadow::addWith(const AnimatableValue* value) const
 {
     // FIXME: The spec doesn't specify anything for shadow in particular, but
     // the default behaviour is probably not what one would expect.
@@ -52,4 +52,9 @@ bool AnimatableShadow::equalTo(const AnimatableValue* value) const
     return m_shadowList == shadowList || (m_shadowList && shadowList && *m_shadowList == *shadowList);
 }
 
+void AnimatableShadow::trace(Visitor* visitor)
+{
+    AnimatableValue::trace(visitor);
+}
+
 } // namespace WebCore