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

Source/core/rendering/RenderInline.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 131 matching lines @@
 
     virtual LayerType layerTypeRequired() const OVERRIDE { return isInFlowPositioned() || createsGroup() || hasClipPath() || style()->shouldCompositeForCurrentAnimations() ? NormalLayer : NoLayer; }
 
     virtual LayoutUnit offsetLeft() const OVERRIDE FINAL;
     virtual LayoutUnit offsetTop() const OVERRIDE FINAL;
     virtual LayoutUnit offsetWidth() const OVERRIDE FINAL { return linesBoundingBox().width(); }
     virtual LayoutUnit offsetHeight() const OVERRIDE FINAL { return linesBoundingBox().height(); }
 
     virtual LayoutRect clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const OVERRIDE;
     virtual LayoutRect rectWithOutlineForRepaint(const RenderLayerModelObject* repaintContainer, LayoutUnit outlineWidth) const OVERRIDE FINAL;
-    virtual void computeRectForRepaint(const RenderLayerModelObject* repaintContainer, LayoutRect&, bool fixed) const OVERRIDE FINAL;
+    virtual void mapRectToRepaintBacking(const RenderLayerModelObject* repaintContainer, LayoutRect&, bool fixed) const OVERRIDE FINAL;
 
     virtual void mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = 0) const OVERRIDE;
 
     virtual PositionWithAffinity positionForPoint(const LayoutPoint&) OVERRIDE FINAL;
 
     virtual LayoutRect frameRectForStickyPositioning() const OVERRIDE FINAL { return linesBoundingBox(); }
 
     virtual IntRect borderBoundingBox() const OVERRIDE FINAL
     {
         IntRect boundingBox = linesBoundingBox();
@@ skipping 27 matching lines @@
     RenderLineBoxList m_lineBoxes;   // All of the line boxes created for this inline flow.  For example, <i>Hello<br>world.</i> will have two <i> line boxes.
 
     bool m_alwaysCreateLineBoxes : 1;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderInline, isRenderInline());
 
 } // namespace WebCore
 
 #endif // RenderInline_h