MacViews: support backgrounds for selected rows

ui/views/controls/tree/tree_view.h

Index: ui/views/controls/tree/tree_view.h
diff --git a/ui/views/controls/tree/tree_view.h b/ui/views/controls/tree/tree_view.h
index 2dc764e7f5688216ff6944f650fcb66feae0de1a..7d3d02e02fb863d00482609e49e8d52f060bcfb9 100644
--- a/ui/views/controls/tree/tree_view.h
+++ b/ui/views/controls/tree/tree_view.h
@@ -294,6 +294,9 @@ class VIEWS_EXPORT TreeView : public ui::TreeModelObserver,
       ui::TreeModelNode* model_node,
       GetInternalNodeCreateType create_type);
 
+  // Returns the bounds for a node's background.
+  gfx::Rect GetBackgroundBoundsForNode(InternalNode* node);
+
   // Returns the bounds for a node.
   gfx::Rect GetBoundsForNode(InternalNode* node);