Add infrastructure for partial layouts

Source/core/rendering/RenderMarquee.h

 /*
  * Copyright (C) 2003 Apple Computer, Inc.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 70 matching lines @@
 
 private:
     virtual const char* renderName() const OVERRIDE FINAL;
 
     virtual bool isMarquee() const OVERRIDE FINAL { return true; }
 
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE FINAL;
 
     virtual void layoutBlock(bool relayoutChildren, LayoutUnit pageLogicalHeight = 0) OVERRIDE FINAL;
 
+    virtual bool supportsPartialLayout() const OVERRIDE { return false; }
+
     void timerFired(Timer<RenderMarquee>*);
 
     int m_currentLoop;
     int m_totalLoops;
     Timer<RenderMarquee> m_timer;
     int m_start;
     int m_end;
     int m_speed;
     Length m_height;
     bool m_reset: 1;
@@ skipping 13 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(!renderer || renderer->isMarquee());
     return static_cast<const RenderMarquee*>(renderer);
 }
 
 // Catch unneeded cast.
 void toRenderMarquee(const RenderMarquee*);
 
 } // namespace WebCore
 
 #endif // RenderMarquee_h