[ABANDONED] Simplify ash shelf dimmer.

ui/views/widget/widget.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_WIDGET_WIDGET_H_
 #define UI_VIEWS_WIDGET_WIDGET_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 584 matching lines @@
                     int operation,
                     ui::DragDropTypes::DragEventSource source);
 
   // Returns the view that requested the current drag operation via
   // RunShellDrag(), or NULL if there is no such view or drag operation.
   View* dragged_view() {
     return const_cast<View*>(const_cast<const Widget*>(this)->dragged_view());
   }
   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);
 
   // Sets the currently visible cursor. If |cursor| is NULL, the cursor used
   // before the current is restored.
   void SetCursor(gfx::NativeCursor cursor);
 
   // Returns true if and only if mouse events are enabled.
   bool IsMouseEventsEnabled() const;
@@ skipping 360 matching lines @@
   bool movement_disabled_;
 
   ScopedObserver<ui::NativeTheme, ui::NativeThemeObserver> observer_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(Widget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_WIDGET_H_