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..87d5da255fcfdeab50ff386e4f24363874ae9fc9 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);
 
@@ -331,6 +334,15 @@ class VIEWS_EXPORT TreeView : public ui::TreeModelObserver,
 
   PrefixSelector* GetPrefixSelector();
 
+  // This function returns the InternalNode (if any) lying under |point|. If no
+  // node lies under |point|, this function returns nullptr. If a non-null node
+  // is returned, its depth is stored in |*depth|.
+  InternalNode* NodeAtPoint(const gfx::Point& point, int* depth = nullptr);
+
+  // This function returns whether |point| is in the bounds of |node|'s
+  // expand/collapse arrow, where |node| is at depth |depth|.
+  bool HitsNodeArrow(InternalNode* node, int depth, const gfx::Point& point);
+
   // The model, may be null.
   ui::TreeModel* model_;