Further plumb visual rect into cc:DisplayItemList.

ui/compositor/paint_context.cc

Index: ui/compositor/paint_context.cc
diff --git a/ui/compositor/paint_context.cc b/ui/compositor/paint_context.cc
index aea2aec90134feb9521cf7a043bb1db1a1dfd999..296667663f80024111d7098e96a5e090a5082c0c 100644
--- a/ui/compositor/paint_context.cc
+++ b/ui/compositor/paint_context.cc
@@ -54,4 +54,13 @@ PaintContext::PaintContext(const PaintContext& other,
 PaintContext::~PaintContext() {
 }
 
+gfx::Rect PaintContext::ToLayerSpaceBounds(
+    const gfx::Size& size_in_layer) const {
+  return gfx::Rect(size_in_layer) + offset_;
+}
+
+gfx::Rect PaintContext::ToLayerSpaceRect(const gfx::Rect& rect) const {
+  return rect + offset_;
+}
+
 }  // namespace ui