Add infrastructure for partial layouts

Source/core/rendering/RenderDetailsMarker.h

 /*
  * Copyright (C) 2010, 2011 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 17 matching lines @@
 class RenderDetailsMarker FINAL : public RenderBlock {
 public:
     RenderDetailsMarker(Element*);
 
     enum Orientation { Up, Down, Left, Right };
 
     Orientation orientation() const;
 
 private:
     virtual const char* renderName() const { return "RenderDetailsMarker"; }
+    virtual bool supportsPartialLayout() const OVERRIDE { return false; }
     virtual bool isDetailsMarker() const { return true; }
     virtual void paint(PaintInfo&, const LayoutPoint&);
 
     bool isOpen() const;
     Path getCanonicalPath() const;
     Path getPath(const LayoutPoint& origin) const;
 };
 
 inline RenderDetailsMarker* toRenderDetailsMarker(RenderObject* object)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isDetailsMarker());
     return static_cast<RenderDetailsMarker*>(object);
 }
 
 inline const RenderDetailsMarker* toRenderDetailsMarker(const RenderObject* object)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isDetailsMarker());
     return static_cast<const RenderDetailsMarker*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderDetailsMarker(const RenderDetailsMarker*);
 
 }
 
 #endif // RenderDetailsMarker_h