Introduce infrastructure for tracing ScriptWrappables.

third_party/WebKit/Source/core/dom/NodeRareData.h

 /*
  * Copyright (C) 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 David Smith <catfish.man@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 84 matching lines @@
     void clearRestyleFlags() { m_restyleFlags = 0; }
 
     enum {
         ConnectedFrameCountBits = 10, // Must fit Page::maxNumberOfFrames.
     };
 
     DECLARE_TRACE();
 
     DECLARE_TRACE_AFTER_DISPATCH();
     void finalizeGarbageCollectedObject();
+    DECLARE_NONVIRTUAL_TRACE_WRAPPERS();
 
 protected:
     explicit NodeRareData(LayoutObject* layoutObject)
         : NodeRareDataBase(layoutObject)
         , m_connectedFrameCount(0)
         , m_elementFlags(0)
         , m_restyleFlags(0)
         , m_isElementRareData(false)
     { }
 
 private:
     Member<NodeListsNodeData> m_nodeLists;
     Member<NodeMutationObserverData> m_mutationObserverData;
 
     unsigned m_connectedFrameCount : ConnectedFrameCountBits;
     unsigned m_elementFlags : NumberOfElementFlags;
     unsigned m_restyleFlags : NumberOfDynamicRestyleFlags;
 protected:
     unsigned m_isElementRareData : 1;
 };
 
 } // namespace blink
 
 #endif // NodeRareData_h