Merge 139365

Source/WebCore/page/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 3084 matching lines @@
             if (scrollbar->isCustomScrollbar())
                 return true;
         }
     }
 
     return false;
 }
 
 FrameView* FrameView::parentFrameView() const
 {
+    if (!parent())
+        return 0;
+
     if (Frame* parentFrame = m_frame->tree()->parent())
         return parentFrame->view();
 
     return 0;
 }
 
 bool FrameView::isInChildFrameWithFrameFlattening() const
 {
     if (!parent() || !m_frame->ownerElement())
         return false;
@@ skipping 694 matching lines @@
 {
 #if USE(ACCELERATED_COMPOSITING)
     if (TiledBacking* tiledBacking = this->tiledBacking())
         tiledBacking->setScrollingPerformanceLoggingEnabled(flag);
 #else
     UNUSED_PARAM(flag);
 #endif
 }
 
 } // namespace WebCore