Oilpan: add Element/Node Member fields to stack allocated objects.

Source/core/dom/shadow/ComposedTreeWalker.h

 /*
  * 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.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 21 matching lines @@
 #include "core/dom/shadow/ShadowRoot.h"
 
 namespace WebCore {
 
 class Node;
 class ShadowRoot;
 
 // FIXME: Make some functions inline to optimise the performance.
 // https://bugs.webkit.org/show_bug.cgi?id=82702
 class ComposedTreeWalker {
+    STACK_ALLOCATED();
 public:
     typedef NodeRenderingTraversal::ParentDetails ParentTraversalDetails;
 
     enum StartPolicy {
         CanStartFromShadowBoundary,
         CannotStartFromShadowBoundary
     };
 
     ComposedTreeWalker(const Node*, StartPolicy = CannotStartFromShadowBoundary);
 
-    Node* get() const { return const_cast<Node*>(m_node); }
+    Node* get() const { return const_cast<Node*>(m_node.get()); }
 
     void firstChild();
     void lastChild();
 
     void nextSibling();
     void previousSibling();
 
     void parent();
 
     void next();
@@ skipping 39 matching lines @@
     static Node* traverseSiblingOrBackToInsertionPoint(const Node*, TraversalDirection);
     static Node* traverseSiblingInCurrentTree(const Node*, TraversalDirection);
 
     static Node* traverseSiblings(const Node*, TraversalDirection);
     static Node* traverseDistributedNodes(const Node*, const InsertionPoint*, TraversalDirection);
 
     static Node* traverseBackToYoungerShadowRoot(const Node*, TraversalDirection);
 
     Node* traverseParentOrHost(const Node*) const;
 
-    const Node* m_node;
+    RawPtrWillBeMember<const Node> m_node;
 };
 
 inline ComposedTreeWalker::ComposedTreeWalker(const Node* node, StartPolicy startPolicy)
     : m_node(node)
 {
 #ifndef NDEBUG
     if (m_node && startPolicy == CannotStartFromShadowBoundary)
         assertPrecondition();
 #endif
 }
@@ skipping 83 matching lines @@
 
 inline Node* ComposedTreeWalker::traverseLastChild(const Node* node) const
 {
     ASSERT(node);
     return traverseChild(node, TraversalDirectionBackward);
 }
 
 } // namespace
 
 #endif