Refactor RenderTreeBuilder and expose special <dialog>

Source/core/dom/NodeRenderingTraversal.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 48 matching lines @@
     const InsertionPoint* m_insertionPoint;
     bool m_resetStyleInheritance;
 };
 
 ContainerNode* parent(const Node*);
 ContainerNode* parent(const Node*, ParentDetails*);
 Node* nextSibling(const Node*);
 Node* previousSibling(const Node*);
 RenderObject* nextSiblingRenderer(const Node*);
 RenderObject* previousSiblingRenderer(const Node*);
+RenderObject* nextInTopLayer(const Element*);
 
 inline ContainerNode* parent(const Node* node)
 {
     ParentDetails unusedDetails;
     return parent(node, &unusedDetails);
 }
 
 inline Element* parentElement(const Node* node)
 {
     ParentDetails unusedDetails;
     Node* found = parent(node, &unusedDetails);
     return found && found->isElementNode() ? toElement(found) : 0;
 }
 
 }
 
 } // namespace WebCore
 
 #endif