[ABANDONED] Simplify ash shelf dimmer.

ui/views/widget/widget.h

Index: ui/views/widget/widget.h
diff --git a/ui/views/widget/widget.h b/ui/views/widget/widget.h
index a92dbce7282d83e4dd9e6552c5be1468a6d444c3..b1bd0d4590ce85a55b15e4d76ece62104b23a67e 100644
--- a/ui/views/widget/widget.h
+++ b/ui/views/widget/widget.h
@@ -602,6 +602,10 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
   }
   const View* dragged_view() const { return dragged_view_; }
 
+  // Minimal drag-and-drop notifications, used to detect drags over widgets.
+  virtual void OnDragEnter();
+  virtual void OnDragExit();
+
   // Adds the specified |rect| in client area coordinates to the rectangle to be
   // redrawn.
   virtual void SchedulePaintInRect(const gfx::Rect& rect);