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

Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 1338 matching lines @@
 
     void elementDataCacheClearTimerFired(Timer<Document>*);
     Timer<Document> m_elementDataCacheClearTimer;
 
     OwnPtrWillBeMember<ElementDataCache> m_elementDataCache;
 
     using LocaleIdentifierToLocaleMap = HashMap<AtomicString, OwnPtr<Locale>>;
     LocaleIdentifierToLocaleMap m_localeCache;
 
     AnimationClock m_animationClock;
-    RefPtrWillBeMember<AnimationTimeline> m_timeline;
+    PersistentWillBeMember<AnimationTimeline> m_timeline;
     CompositorPendingAnimations m_compositorPendingAnimations;
 
     RefPtrWillBeMember<Document> m_templateDocument;
     // With Oilpan the templateDocument and the templateDocumentHost
     // live and die together. Without Oilpan, the templateDocumentHost
     // is a manually managed backpointer from m_templateDocument.
     RawPtrWillBeMember<Document> m_templateDocumentHost;
 
     Timer<Document> m_didAssociateFormControlsTimer;
     WillBeHeapHashSet<RefPtrWillBeMember<Element>> m_associatedFormControls;
@@ skipping 61 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif // Document_h