Cancel drag if display configuration changes.

ui/aura/root_window.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_AURA_ROOT_WINDOW_H_
 #define UI_AURA_ROOT_WINDOW_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 108 matching lines @@
 
   // Initializes the root window.
   void Init();
 
   // Shows the root window host.
   void ShowRootWindow();
 
   // Hides the root window host.
   void HideRootWindow();
 
+  // Stop listening events in preparation for shutdown.
+  void PrepareForShutdown();
+
   RootWindowHostDelegate* AsRootWindowHostDelegate();
 
   // Sets the size of the root window.
   void SetHostSize(const gfx::Size& size_in_pixel);
   gfx::Size GetHostSize() const;
 
   // Sets the bounds of the host window.
   void SetHostBounds(const gfx::Rect& size_in_pixel);
 
   // Returns where the RootWindow is on screen.
@@ skipping 278 matching lines @@
 
   CompositorLock* compositor_lock_;
   bool draw_on_compositor_unlock_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindow);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_H_