Allow the cursor to warp even when a window is dragged

ash/screen_ash.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 "ash/screen_ash.h"
 
 #include "ash/shell.h"
+#include "ash/wm/coordinate_conversion.h"
 #include "ash/wm/shelf_layout_manager.h"
 #include "base/logging.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/display_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/screen.h"
 
 namespace ash {
@@ skipping 58 matching lines @@
       ConvertPointFromScreen(window, &point);
   return gfx::Rect(point, rect.size());
 }
 
 gfx::Point ScreenAsh::GetCursorScreenPoint() {
   return aura::Env::GetInstance()->last_mouse_location();
 }
 
 gfx::NativeWindow ScreenAsh::GetWindowAtCursorScreenPoint() {
   const gfx::Point point = gfx::Screen::GetCursorScreenPoint();
-  return Shell::GetRootWindowAt(point)->GetTopWindowContainingPoint(point);
+  return wm::GetRootWindowAt(point)->GetTopWindowContainingPoint(point);
 }
 
 int ScreenAsh::GetNumDisplays() {
   return GetDisplayManager()->GetNumDisplays();
 }
 
 gfx::Display ScreenAsh::GetDisplayNearestWindow(gfx::NativeView window) const {
   return GetDisplayManager()->GetDisplayNearestWindow(window);
 }
 
 gfx::Display ScreenAsh::GetDisplayNearestPoint(const gfx::Point& point) const {
   return GetDisplayManager()->GetDisplayNearestPoint(point);
 }
 
 gfx::Display ScreenAsh::GetDisplayMatching(const gfx::Rect& match_rect) const {
   return GetDisplayManager()->GetDisplayMatching(match_rect);
 }
 
 gfx::Display ScreenAsh::GetPrimaryDisplay() const {
   return *GetDisplayManager()->GetDisplayAt(0);
 }
 
 }  // namespace ash