Calculate paint invalidation rect for scrollbars

third_party/WebKit/Source/core/frame/VisualViewport.cpp

 /*
  * Copyright (C) 2013 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 525 matching lines @@
 IntSize VisualViewport::contentsSize() const
 {
     LocalFrame* frame = mainFrame();
 
     if (!frame || !frame->view())
         return IntSize();
 
     return frame->view()->visibleContentRect(IncludeScrollbars).size();
 }
 
-void VisualViewport::invalidateScrollbarRect(Scrollbar*, const IntRect&)
-{
-    // Do nothing. Visual scrollbars live on the compositor thread and will
-    // be updated when the viewport is synced to the CC.
-}
-
 void VisualViewport::setScrollOffset(const IntPoint& offset, ScrollType scrollType)
 {
     setScrollOffset(DoublePoint(offset), scrollType);
 }
 
 void VisualViewport::setScrollOffset(const DoublePoint& offset, ScrollType)
 {
     setLocation(toFloatPoint(offset));
 }
 
@@ skipping 175 matching lines @@
     } else if (graphicsLayer == m_rootTransformLayer) {
         name =  "Root Transform Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink