Add infrastructure for partial layouts

Source/core/rendering/RenderTable.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, 2009, 2010 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 260 matching lines @@
 
     virtual bool isTable() const { return true; }
 
     virtual bool avoidsFloats() const { return true; }
 
     virtual void paint(PaintInfo&, const LayoutPoint&);
     virtual void paintObject(PaintInfo&, const LayoutPoint&);
     virtual void paintBoxDecorations(PaintInfo&, const LayoutPoint&);
     virtual void paintMask(PaintInfo&, const LayoutPoint&);
     virtual void layout();
+    virtual bool supportsPartialLayout() const OVERRIDE { return false; }
     virtual void computeIntrinsicLogicalWidths(LayoutUnit& minWidth, LayoutUnit& maxWidth) const OVERRIDE;
     virtual void computePreferredLogicalWidths() OVERRIDE;
     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE;
 
     virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const OVERRIDE;
     virtual int firstLineBoxBaseline() const OVERRIDE;
     virtual int inlineBlockBaseline(LineDirectionMode) const OVERRIDE;
 
     RenderTableCol* slowColElement(unsigned col, bool* startEdge, bool* endEdge) const;
 
@@ skipping 68 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isTable());
     return static_cast<const RenderTable*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderTable(const RenderTable*);
 
 } // namespace WebCore
 
 #endif // RenderTable_h