Cancel drag if display configuration changes.

ui/aura/root_window_host_win.cc

 // 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.
 
 #include "ui/aura/root_window_host_win.h"
 
 #include <windows.h>
 
 #include <algorithm>
 
@@ skipping 286 matching lines @@
 void RootWindowHostWin::PostNativeEvent(const base::NativeEvent& native_event) {
   ::PostMessage(
       hwnd(), native_event.message, native_event.wParam, native_event.lParam);
 }
 
 void RootWindowHostWin::OnDeviceScaleFactorChanged(
     float device_scale_factor) {
   NOTIMPLEMENTED();
 }
 
+void RootWindowHostWin::PrepareForShutdown() {
+  NOTIMPLEMENTED();
+}
+
 void RootWindowHostWin::OnClose() {
   // TODO: this obviously shouldn't be here.
   MessageLoopForUI::current()->Quit();
 }
 
 LRESULT RootWindowHostWin::OnKeyEvent(UINT message,
                                       WPARAM w_param,
                                       LPARAM l_param) {
   MSG msg = { hwnd(), message, w_param, l_param };
   ui::KeyEvent keyev(msg, message == WM_CHAR);
@@ skipping 30 matching lines @@
 }
 
 void RootWindowHostWin::OnSize(UINT param, const CSize& size) {
   // Minimizing resizes the window to 0x0 which causes our layout to go all
   // screwy, so we just ignore it.
   if (param != SIZE_MINIMIZED)
     delegate_->OnHostResized(gfx::Size(size.cx, size.cy));
 }
 
 }  // namespace aura