Oilpan: Prepare to move RenderObject and RenderObjectChildList to Oilpan heap.

Source/core/dom/NodeRareData.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/dom/NodeRareData.h"
 #include "core/dom/Element.h"
 #include "core/dom/ElementRareData.h"
 #include "core/page/Page.h"
+#include "core/rendering/RenderObject.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 struct SameSizeAsNodeRareData {
     void* m_pointer[2];
     OwnPtrWillBeMember<NodeMutationObserverData> m_mutationObserverData;
     unsigned m_bitfields;
 };
 
 COMPILE_ASSERT(sizeof(NodeRareData) == sizeof(SameSizeAsNodeRareData), NodeRareDataShouldStaySmall);
 
 void NodeRareData::traceAfterDispatch(Visitor* visitor)
 {
+#if ENABLE(OILPAN)
+    visitor->trace(m_renderer);
+#endif
     visitor->trace(m_mutationObserverData);
     // Do not keep empty NodeListsNodeData objects around.
     if (m_nodeLists && m_nodeLists->isEmpty())
         m_nodeLists.clear();
     else
         visitor->trace(m_nodeLists);
 }
 
 void NodeRareData::trace(Visitor* visitor)
 {
     if (m_isElementRareData)
         static_cast<ElementRareData*>(this)->traceAfterDispatch(visitor);
     else
         traceAfterDispatch(visitor);
 }
 
 void NodeRareData::finalizeGarbageCollectedObject()
 {
     RELEASE_ASSERT(!renderer());
     if (m_isElementRareData)
         static_cast<ElementRareData*>(this)->~ElementRareData();
     else
         this->~NodeRareData();
 }
 
 // Ensure the 10 bits reserved for the m_connectedFrameCount cannot overflow
 COMPILE_ASSERT(Page::maxNumberOfFrames < (1 << NodeRareData::ConnectedFrameCountBits), Frame_limit_should_fit_in_rare_data_count);
 
 } // namespace blink