[Oilpan] Migrate most classes under core/animations to Oilpan heap.

Source/core/animation/AnimationStack.h

Index: Source/core/animation/AnimationStack.h
diff --git a/Source/core/animation/AnimationStack.h b/Source/core/animation/AnimationStack.h
index 1dd738fefb7ab154ebd3237af42a8ecd27f2abb2..b1663cc022480f59310a1ed75ab4f91a47d2f56e 100644
--- a/Source/core/animation/AnimationStack.h
+++ b/Source/core/animation/AnimationStack.h
@@ -43,7 +43,7 @@
 
 namespace blink {
 
-using ActiveInterpolationMap = WillBeHeapHashMap<PropertyHandle, RefPtrWillBeMember<Interpolation>>;
+using ActiveInterpolationMap = HeapHashMap<PropertyHandle, Member<Interpolation>>;
 
 class InertEffect;
 
@@ -53,10 +53,10 @@ class CORE_EXPORT AnimationStack {
 public:
     AnimationStack();
 
-    void add(PassOwnPtrWillBeRawPtr<SampledEffect> effect) { m_effects.append(effect); }
+    void add(SampledEffect* effect) { m_effects.append(effect); }
     bool isEmpty() const { return m_effects.isEmpty(); }
     bool hasActiveAnimationsOnCompositor(CSSPropertyID) const;
-    static ActiveInterpolationMap activeInterpolations(AnimationStack*, const WillBeHeapVector<RawPtrWillBeMember<InertEffect>>* newAnimations, const WillBeHeapHashSet<RawPtrWillBeMember<const Animation>>* suppressedAnimations, KeyframeEffect::Priority, double timelineCurrentTime);
+    static ActiveInterpolationMap activeInterpolations(AnimationStack*, const HeapVector<Member<InertEffect>>* newAnimations, const HeapHashSet<Member<const Animation>>* suppressedAnimations, KeyframeEffect::Priority, double timelineCurrentTime);
 
     bool getAnimatedBoundingBox(FloatBox&, CSSPropertyID) const;
     DECLARE_TRACE();
@@ -65,7 +65,7 @@ private:
     void removeClearedEffects();
 
     // Effects sorted by priority. Lower priority at the start of the list.
-    WillBeHeapVector<OwnPtrWillBeMember<SampledEffect>> m_effects;
+    HeapVector<Member<SampledEffect>> m_effects;
 
     friend class AnimationAnimationStackTest;
 };