Fire overflowchanged events at raf timing

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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 3350 matching lines @@
     return m_dragOperation;
 }
 
 void WebViewImpl::sendResizeEventAndRepaint()
 {
     // FIXME: This is wrong. The FrameView is responsible sending a resizeEvent
     // as part of layout. Layout is also responsible for sending invalidations
     // to the embedder. This method and all callers may be wrong. -- eseidel.
     if (mainFrameImpl()->frameView()) {
         // Enqueues the resize event.
-        mainFrameImpl()->frame()->eventHandler().sendResizeEvent();
+        mainFrameImpl()->frame()->document()->enqueueResizeEvent();
     }
 
     if (m_client) {
         if (isAcceleratedCompositingActive()) {
             updateLayerTreeViewport();
         } else {
             WebRect damagedRect(0, 0, m_size.width, m_size.height);
             m_client->didInvalidateRect(damagedRect);
         }
     }
@@ skipping 797 matching lines @@
     const PageScaleConstraints& constraints = m_pageScaleConstraintsSet.pageDefinedConstraints();
 
     if (!mainFrameImpl() || !mainFrameImpl()->frameView())
         return false;
 
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 } // namespace blink