Introduce infrastructure for tracing ScriptWrappables.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004-2011, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.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
@@ skipping 665 matching lines @@
     HTMLSlotElement* assignedSlot() const;
     HTMLSlotElement* assignedSlotForBinding();
 
     void setAlreadySpellChecked(bool flag) { setFlag(flag, AlreadySpellCheckedFlag); }
     bool isAlreadySpellChecked() { return getFlag(AlreadySpellCheckedFlag); }
 
     bool isFinishedParsingChildren() const { return getFlag(IsFinishedParsingChildrenFlag); }
 
     DECLARE_VIRTUAL_TRACE();
 
+    OVERRIDE_TRACE_WRAPPERS();
+
     unsigned lengthOfContents() const;
 
     v8::Local<v8::Object> wrap(v8::Isolate*, v8::Local<v8::Object> creationContext) override;
     v8::Local<v8::Object> associateWithWrapper(v8::Isolate*, const WrapperTypeInfo*, v8::Local<v8::Object> wrapper) override WARN_UNUSED_RETURN;
 
 private:
     enum NodeFlags {
         HasRareDataFlag = 1,
 
         // Node type flags. These never change once created.
@@ skipping 73 matching lines @@
 
     static void reattachWhitespaceSiblingsIfNeeded(Text* start);
 
 #if !ENABLE(OILPAN)
     void willBeDeletedFromDocument();
 #endif
 
     bool hasRareData() const { return getFlag(HasRareDataFlag); }
 
     NodeRareData* rareData() const;
+    NodeRareData* maybeRareData() const;
     NodeRareData& ensureRareData();
 #if !ENABLE(OILPAN)
     void clearRareData();
 
     void clearEventTargetData();
 #endif
 
     void setHasCustomStyleCallbacks() { setFlag(true, HasCustomStyleCallbacksFlag); }
 
     void setTreeScope(TreeScope* scope) { m_treeScope = scope; }
@@ skipping 141 matching lines @@
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showNode(const blink::Node*);
 void showTree(const blink::Node*);
 void showNodePath(const blink::Node*);
 #endif
 
 #endif // Node_h