Add infrastructure for partial layouts

Source/core/rendering/RenderRuby.h

 /*
  * Copyright (C) 2009 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 47 matching lines @@
 
     virtual void addChild(RenderObject* child, RenderObject* beforeChild = 0);
     virtual void removeChild(RenderObject* child);
 
 protected:
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
 
 private:
     virtual bool isRuby() const { return true; }
     virtual const char* renderName() const { return "RenderRuby (inline)"; }
+    virtual bool supportsPartialLayout() const OVERRIDE { return false; }
     virtual bool createsAnonymousWrapper() const { return true; }
     virtual void removeLeftoverAnonymousBlock(RenderBlock*) { ASSERT_NOT_REACHED(); }
 };
 
 // <ruby> when used as 'display:block' or 'display:inline-block'
 class RenderRubyAsBlock FINAL : public RenderBlock {
 public:
     RenderRubyAsBlock(Element*);
     virtual ~RenderRubyAsBlock();
 
     virtual void addChild(RenderObject* child, RenderObject* beforeChild = 0);
     virtual void removeChild(RenderObject* child);
 
 protected:
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
 
 private:
     virtual bool isRuby() const { return true; }
     virtual const char* renderName() const { return "RenderRuby (block)"; }
+    virtual bool supportsPartialLayout() const OVERRIDE { return false; }
     virtual bool createsAnonymousWrapper() const { return true; }
     virtual void removeLeftoverAnonymousBlock(RenderBlock*) { ASSERT_NOT_REACHED(); }
 };
 
 } // namespace WebCore
 
 #endif // RenderRuby_h