Further plumb visual rect into cc:DisplayItemList.

ui/compositor/paint_context.h

Index: ui/compositor/paint_context.h
diff --git a/ui/compositor/paint_context.h b/ui/compositor/paint_context.h
index ee9134ed837f6bcbd7e7a669a05d43d2da8a93e5..ddcf629a8e76873c4787e5e32ce22f4820bba14c 100644
--- a/ui/compositor/paint_context.h
+++ b/ui/compositor/paint_context.h
@@ -78,6 +78,13 @@ class COMPOSITOR_EXPORT PaintContext {
   // cache contents.
   friend class PaintCache;
 
+  // Returns a rect with the given size in the space of the context's
+  // containing layer.
+  gfx::Rect ToLayerSpaceBounds(const gfx::Size& size_in_layer) const;
+
+  // Returns the given rect translated by the layer space offset.
+  gfx::Rect ToLayerSpaceRect(const gfx::Rect& rect) const;
+
   cc::DisplayItemList* list_;
   scoped_ptr<SkPictureRecorder> owned_recorder_;
   // A pointer to the |owned_recorder_| in this PaintContext, or in another one