Add infrastructure for partial layouts

Source/core/html/shadow/SliderThumbElement.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 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.
@@ skipping 75 matching lines @@
 
 // --------------------------------
 
 class RenderSliderThumb FINAL : public RenderBlock {
 public:
     RenderSliderThumb(SliderThumbElement*);
     void updateAppearance(RenderStyle* parentStyle);
 
 private:
     virtual bool isSliderThumb() const;
+    virtual bool supportsPartialLayout() const OVERRIDE { return false; }
 };
 
 // --------------------------------
 
 class SliderContainerElement FINAL : public HTMLDivElement {
 public:
     static PassRefPtr<SliderContainerElement> create(Document&);
 
 private:
     SliderContainerElement(Document&);
     virtual RenderObject* createRenderer(RenderStyle*);
     virtual const AtomicString& part() const;
 };
 
 }
 
 #endif