Add infrastructure for partial layouts

Source/core/rendering/RenderTableCell.h

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 103 matching lines @@
     virtual int borderStart() const;
     virtual int borderEnd() const;
     virtual int borderBefore() const;
     virtual int borderAfter() const;
 
     void collectBorderValues(RenderTable::CollapsedBorderValues&) const;
     static void sortBorderValues(RenderTable::CollapsedBorderValues&);
 
     virtual void layout();
 
+    virtual bool supportsPartialLayout() const OVERRIDE { return false; }
+
     virtual void paint(PaintInfo&, const LayoutPoint&);
 
     void paintCollapsedBorders(PaintInfo&, const LayoutPoint&);
     void paintBackgroundsBehindCell(PaintInfo&, const LayoutPoint&, RenderObject* backgroundObject);
 
     LayoutUnit cellBaselinePosition() const;
     bool isBaselineAligned() const
     {
         EVerticalAlign va = style()->verticalAlign();
         return va == BASELINE || va == TEXT_BOTTOM || va == TEXT_TOP || va == SUPER || va == SUB || va == LENGTH;
@@ skipping 159 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isTableCell());
     return static_cast<const RenderTableCell*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderTableCell(const RenderTableCell*);
 
 } // namespace WebCore
 
 #endif // RenderTableCell_h