Oilpan: Move CSSAnimations, CSSAnimationUpdate and ActiveAnimations to oilpan's heap

Source/core/animation/ActiveAnimations.h

Index: Source/core/animation/ActiveAnimations.h
diff --git a/Source/core/animation/ActiveAnimations.h b/Source/core/animation/ActiveAnimations.h
index 67259ab69f1746d8d2424c01baba1731041664cf..49c4f3637abbd01558ea5b9df3fe9d2691c1a3b7 100644
--- a/Source/core/animation/ActiveAnimations.h
+++ b/Source/core/animation/ActiveAnimations.h
@@ -49,10 +49,12 @@ bool shouldCompositeForActiveAnimations(const RenderObject&);
 bool hasActiveAnimations(const RenderObject&, CSSPropertyID);
 bool hasActiveAnimationsOnCompositor(const RenderObject&, CSSPropertyID);
 
-class ActiveAnimations {
+class ActiveAnimations : public NoBaseWillBeGarbageCollectedFinalized<ActiveAnimations> {
 public:
     ActiveAnimations()
-        : m_animationStyleChange(false) { }
+        : m_animationStyleChange(false)
+    {
+    }
 
     // Animations that are currently active for this element, their effects will be applied
     // during a style recalc. CSS Transitions are included in this stack.
@@ -78,6 +80,8 @@ public:
 
     void setAnimationStyleChange(bool animationStyleChange) { m_animationStyleChange = animationStyleChange; }
 
+    void trace(Visitor*);
+
 private:
     bool isAnimationStyleChange() const { return m_animationStyleChange; }