Let V8 know about the external memory owned by large StaticNodeList

Source/core/dom/StaticNodeList.h

 /*
  * Copyright (C) 2007, 2008 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 23 matching lines @@
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class Node;
 
 class StaticNodeList FINAL : public NodeList {
 public:
-    static PassRefPtr<StaticNodeList> adopt(Vector<RefPtr<Node> >& nodes)
-    {
-        RefPtr<StaticNodeList> nodeList = adoptRef(new StaticNodeList);
-        nodeList->m_nodes.swap(nodes);
-        return nodeList.release();
-    }
+    static PassRefPtr<StaticNodeList> adopt(Vector<RefPtr<Node> >& nodes);
 
     static PassRefPtr<StaticNodeList> createEmpty()
     {
         return adoptRef(new StaticNodeList);
     }
 
+    virtual ~StaticNodeList();
+
     virtual unsigned length() const OVERRIDE;
     virtual Node* item(unsigned index) const OVERRIDE;
 
 private:
+    // If AllocationSize() is larger than this, we report it as external
+    // allocated memory to V8.
+    const static ptrdiff_t externalMemoryReportSizeLimit = 1024;
+
+    ptrdiff_t AllocationSize()
+    {
+        return m_nodes.capacity() * sizeof(RefPtr<Node>);
+    }
+
     Vector<RefPtr<Node> > m_nodes;
 };
 
 } // namespace WebCore
 
 #endif // StaticNodeList_h