views: Dispatch mouse events using EventDispatch interface too.

ui/views/widget/root_view.h

Index: ui/views/widget/root_view.h
diff --git a/ui/views/widget/root_view.h b/ui/views/widget/root_view.h
index 377bf24cc4b6daf73592a9af9866366d7998d7a8..a7715377713ba77a91f24cfd0a404f7787f0c30b 100644
--- a/ui/views/widget/root_view.h
+++ b/ui/views/widget/root_view.h
@@ -117,6 +117,7 @@ class VIEWS_EXPORT RootView : public View,
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
   virtual gfx::Vector2d CalculateOffsetToAncestorWithLayer(
       ui::Layer** layer_parent) OVERRIDE;
+  virtual View::DragInfo* GetDragInfo() OVERRIDE;
 
  private:
   friend class View;
@@ -138,6 +139,14 @@ class VIEWS_EXPORT RootView : public View,
 
   void DispatchEventToTarget(View* target, ui::Event* event);
 
+  // |view| is the view receiving |event|. This function sends the event to all
+  // the Views up the hierarchy that has |notify_enter_exit_on_child_| flag
+  // turned on, but does not contain |sibling|.
+  void NotifyEnterExitOfDescendant(const ui::MouseEvent& event,
+                                   ui::EventType type,
+                                   View* view,
+                                   View* sibling);
+
   // Overridden from ui::EventDispatcherDelegate:
   virtual bool CanDispatchToTarget(ui::EventTarget* target) OVERRIDE;