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

Source/core/rendering/RenderReplaced.cpp

Index: Source/core/rendering/RenderReplaced.cpp
diff --git a/Source/core/rendering/RenderReplaced.cpp b/Source/core/rendering/RenderReplaced.cpp
index 91ddc66d9c9fc988d72087a917c4c3d6fa4301d3..5084f24e0c11b56771460ae5f8a63f42e2ba0ddc 100644
--- a/Source/core/rendering/RenderReplaced.cpp
+++ b/Source/core/rendering/RenderReplaced.cpp
@@ -547,7 +547,7 @@ LayoutRect RenderReplaced::selectionRectForRepaint(const RenderLayerModelObject*
 
     LayoutRect rect = localSelectionRect();
     if (clipToVisibleContent)
-        computeRectForRepaint(repaintContainer, rect);
+        mapRectToRepaintBacking(repaintContainer, rect);
     else
         rect = localToContainerQuad(FloatRect(rect), repaintContainer).enclosingBoundingBox();
 
@@ -625,7 +625,7 @@ LayoutRect RenderReplaced::clippedOverflowRectForRepaint(const RenderLayerModelO
         r.move(v->layoutDelta());
     }
 
-    computeRectForRepaint(repaintContainer, r);
+    mapRectToRepaintBacking(repaintContainer, r);
     return r;
 }