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

Source/core/animation/Animation.h

Index: Source/core/animation/Animation.h
diff --git a/Source/core/animation/Animation.h b/Source/core/animation/Animation.h
index 9433247fc0d0123e040addddd974c88df979471b..818da9f6d6a299c727967085934053d96116c799 100644
--- a/Source/core/animation/Animation.h
+++ b/Source/core/animation/Animation.h
@@ -51,12 +51,7 @@ class Element;
 class ExceptionState;
 class WebCompositorAnimationPlayer;
 
-class CORE_EXPORT Animation final
-    : public EventTargetWithInlineData
-    , public RefCountedWillBeNoBase<Animation>
-    , public ActiveDOMObject
-    , public WebCompositorAnimationDelegate
-    , public WebCompositorAnimationPlayerClient {
+class CORE_EXPORT Animation final : public EventTargetWithInlineData, public RefCountedWillBeNoBase<Animation>, public ActiveDOMObject, public WebCompositorAnimationDelegate, public WebCompositorAnimationPlayerClient {
     DEFINE_WRAPPERTYPEINFO();
     REFCOUNTED_EVENT_TARGET(Animation);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(Animation);
@@ -213,8 +208,8 @@ private:
     PersistentWillBeMember<AnimationPromise> m_finishedPromise;
     PersistentWillBeMember<AnimationPromise> m_readyPromise;
 
-    RefPtrWillBeMember<AnimationEffect> m_content;
-    RawPtrWillBeMember<AnimationTimeline> m_timeline;
+    PersistentWillBeMember<AnimationEffect> m_content;
+    PersistentWillBeMember<AnimationTimeline> m_timeline;
     // Reflects all pausing, including via pauseForTesting().
     bool m_paused;
     bool m_held;