Cancel drag if display configuration changes.

ui/aura/root_window.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.h"
 
 #include <vector>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 183 matching lines @@
 }
 
 void RootWindow::ShowRootWindow() {
   host_->Show();
 }
 
 void RootWindow::HideRootWindow() {
   host_->Hide();
 }
 
+void RootWindow::PrepareForShutdown() {
+  host_->PrepareForShutdown();
+  // discard synthesize event request as well.
+  synthesize_mouse_move_ = false;
+}
+
 RootWindowHostDelegate* RootWindow::AsRootWindowHostDelegate() {
   return this;
 }
 
 void RootWindow::SetHostSize(const gfx::Size& size_in_pixel) {
   DispatchHeldMouseMove();
   gfx::Rect bounds = host_->GetBounds();
   bounds.set_size(size_in_pixel);
   host_->SetBounds(bounds);
 
@@ skipping 873 matching lines @@
 void RootWindow::UnlockCompositor() {
   DCHECK(compositor_lock_);
   compositor_lock_ = NULL;
   if (draw_on_compositor_unlock_) {
     draw_on_compositor_unlock_ = false;
     ScheduleDraw();
   }
 }
 
 }  // namespace aura