Avoid N^2 walk placing renderers when building the render tree

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, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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 547 matching lines @@
     // the node's rendering object from the rendering tree and delete it.
     virtual void detach(const AttachContext& = AttachContext());
 
 #ifndef NDEBUG
     bool inDetach() const;
 #endif
 
     void reattach(const AttachContext& = AttachContext());
     void lazyReattachIfAttached();
     ContainerNode* parentNodeForRenderingAndStyle();
-    
+
+    void reattachWhitespaceSiblings() const;
+
     // Wrapper for nodes that don't have a renderer, but still cache the style (like HTMLOptionElement).
     RenderStyle* renderStyle() const;
 
     RenderStyle* computedStyle(PseudoId pseudoElementSpecifier = NOPSEUDO) { return virtualComputedStyle(pseudoElementSpecifier); }
 
     // -----------------------------------------------------------------------------
     // Notification of document structure changes (see ContainerNode.h for more notification methods)
     //
     // At first, WebKit notifies the node that it has been inserted into the document. This is called during document parsing, and also
     // when a node is added through the DOM methods insertBefore(), appendChild() or replaceChild(). The call happens _after_ the node has been added to the tree.
@@ skipping 359 matching lines @@
 
 } //namespace
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const WebCore::Node*);
 void showNodePath(const WebCore::Node*);
 #endif
 
 #endif