[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 80aed6d7c775fa8b277aa95d21254f074703324e..7bf4f0e452c7728a1e5f04990ae962fc7abfdc00 100644
--- a/Source/core/animation/AnimationStack.h
+++ b/Source/core/animation/AnimationStack.h
@@ -42,7 +42,7 @@
 
 namespace blink {
 
-using ActiveInterpolationMap = WillBeHeapHashMap<PropertyHandle, RefPtrWillBeMember<Interpolation>>;
+using ActiveInterpolationMap = HeapHashMap<PropertyHandle, Member<Interpolation>>;
 
 class InertAnimation;
 
@@ -52,17 +52,17 @@ 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<InertAnimation>>* newAnimations, const WillBeHeapHashSet<RawPtrWillBeMember<const AnimationPlayer>>* suppressedAnimationPlayers, Animation::Priority, double timelineCurrentTime);
+    static ActiveInterpolationMap activeInterpolations(AnimationStack*, const HeapVector<Member<InertAnimation>>* newAnimations, const WillBeHeapHashSet<RawPtrWillBeMember<const AnimationPlayer>>* suppressedAnimationPlayers, Animation::Priority, double timelineCurrentTime);
 
     bool getAnimatedBoundingBox(FloatBox&, CSSPropertyID) const;
     DECLARE_TRACE();
 
 private:
     // 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;
 };