Add StyleChangeState to get rid of a bunch of static state in the render tree.

Source/WebCore/rendering/RenderWidget.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 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
  * 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,
@@ skipping 61 matching lines @@
     RenderArena* ref() { ++m_refCount; return renderArena(); }
     void deref(RenderArena*);
 
 protected:
     RenderWidget(Element*);
 
     FrameView* frameView() const { return m_frameView; }
 
     void clearWidget();
 
-    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
+    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle, const StyleChangeState&) OVERRIDE;
     virtual void layout();
     virtual void paint(PaintInfo&, const LayoutPoint&);
     virtual CursorDirective getCursor(const LayoutPoint&, Cursor&) const;
     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE;
 
     virtual void paintContents(PaintInfo&, const LayoutPoint&);
 
 private:
     virtual bool isWidget() const { return true; }
 
@@ skipping 22 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isWidget());
     return static_cast<const RenderWidget*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderWidget(const RenderWidget*);
 
 } // namespace WebCore
 
 #endif // RenderWidget_h