Cancel drag if display configuration changes.

ui/views/widget/desktop_root_window_host_win.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_DESKTOP_ROOT_WINDOW_HOST_WIN_H_
 #define UI_VIEWS_WIDGET_DESKTOP_ROOT_WINDOW_HOST_WIN_H_
 
 #include "ui/aura/root_window_host.h"
 #include "ui/views/widget/desktop_root_window_host.h"
 #include "ui/views/win/hwnd_message_handler_delegate.h"
@@ skipping 32 matching lines @@
   virtual bool QueryMouseLocation(gfx::Point* location_return) OVERRIDE;
   virtual bool ConfineCursorToRootWindow() OVERRIDE;
   virtual void UnConfineCursor() OVERRIDE;
   virtual void MoveCursorTo(const gfx::Point& location) OVERRIDE;
   virtual void SetFocusWhenShown(bool focus_when_shown) OVERRIDE;
   virtual bool GrabSnapshot(
       const gfx::Rect& snapshot_bounds,
       std::vector<unsigned char>* png_representation) OVERRIDE;
   virtual void PostNativeEvent(const base::NativeEvent& native_event) OVERRIDE;
   virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
+  virtual void PrepareForShutdown() OVERRIDE;
 
   // Overridden from HWNDMessageHandlerDelegate:
   virtual bool IsWidgetWindow() const OVERRIDE;
   virtual bool IsUsingCustomFrame() const OVERRIDE;
   virtual void SchedulePaint() OVERRIDE;
   virtual void EnableInactiveRendering() OVERRIDE;
   virtual bool IsInactiveRenderingDisabled() OVERRIDE;
   virtual bool CanResize() const OVERRIDE;
   virtual bool CanMaximize() const OVERRIDE;
   virtual bool CanActivate() const OVERRIDE;
@@ skipping 71 matching lines @@
 
   aura::RootWindowHostDelegate* root_window_host_delegate_;
   aura::Window* content_window_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopRootWindowHostWin);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_ROOT_WINDOW_HOST_WIN_H_