Store repaint rects in the coordinate space of their backing GraphicsLayer.

Source/core/rendering/RenderListMarker.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2010 Daniel Bates (dbates@intudata.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 1820 matching lines @@
 {
     ASSERT(!needsLayout());
 
     if (selectionState() == SelectionNone || !inlineBoxWrapper())
         return LayoutRect();
 
     RootInlineBox& root = inlineBoxWrapper()->root();
     LayoutRect rect(0, root.selectionTop() - y(), width(), root.selectionHeight());
 
     if (clipToVisibleContent)
-        computeRectForRepaint(repaintContainer, rect);
+        mapRectToRepaintBacking(repaintContainer, rect);
     else
         rect = localToContainerQuad(FloatRect(rect), repaintContainer).enclosingBoundingBox();
 
     return rect;
 }
 
 } // namespace WebCore