Fire overflowchanged events at raf timing

Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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 26 matching lines @@
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class AXObjectCache;
 class Element;
 class FloatSize;
 class Frame;
 class KURL;
 class Node;
-class OverflowEvent;
 class Page;
 class RenderBox;
 class RenderEmbeddedObject;
 class RenderObject;
 class RenderScrollbarPart;
 class RenderStyle;
 
 Pagination::Mode paginationModeForRenderStyle(RenderStyle*);
 
 typedef unsigned long long DOMTimeStamp;
@@ skipping 142 matching lines @@
     bool hasViewportConstrainedObjects() const { return m_viewportConstrainedObjects && m_viewportConstrainedObjects->size() > 0; }
 
     void handleLoadCompleted();
     void resetDeferredRepaintDelay();
 
     void updateAnnotatedRegions();
     void updateControlTints();
 
     void restoreScrollbar();
 
-    void suspendOverflowEvents();
-    void resumeOverflowEvents();
-    void scheduleOverflowEvent(PassRefPtr<OverflowEvent>);
-
     void postLayoutTimerFired(Timer<FrameView>*);
 
     bool wasScrolledByUser() const;
     void setWasScrolledByUser(bool);
 
     bool safeToPropagateScrollToParent() const { return m_safeToPropagateScrollToParent; }
     void setSafeToPropagateScrollToParent(bool isSafe) { m_safeToPropagateScrollToParent = isSafe; }
 
     void addWidgetToUpdate(RenderObject*);
     void removeWidgetToUpdate(RenderObject*);
@@ skipping 267 matching lines @@
 
     bool m_firstLayout;
     bool m_isTransparent;
     Color m_baseBackgroundColor;
     IntSize m_lastViewportSize;
     float m_lastZoomFactor;
 
     AtomicString m_mediaType;
     AtomicString m_mediaTypeWhenNotPrinting;
 
-    unsigned m_overflowEventSuspendCount;
-    Vector<RefPtr<OverflowEvent> > m_overflowEventQueue;
-
     bool m_overflowStatusDirty;
     bool m_horizontalOverflow;
     bool m_verticalOverflow;
     RenderObject* m_viewportRenderer;
 
     Pagination m_pagination;
 
     bool m_wasScrolledByUser;
     bool m_inProgrammaticScroll;
     bool m_safeToPropagateScrollToParent;
@@ skipping 91 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(!widget || widget->isFrameView());
     return static_cast<const FrameView*>(widget);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toFrameView(const FrameView*);
 
 } // namespace WebCore
 
 #endif // FrameView_h