Move the panel to the root window where the mouse click occurred.

ash/launcher/launcher_util.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 ASH_LAUNCHER_LAUNCHER_UTIL_H_
 #define ASH_LAUNCHER_LAUNCHER_UTIL_H_
 
 #include "ash/ash_export.h"
 
+namespace aura {
+class Window;
+}
+
+namespace ui {
+class Event;
+}
+
 namespace ash {
 class LauncherModel;
 
 namespace launcher {
 
 // Return the index of the browser item from a given |launcher_model|.
 ASH_EXPORT int GetBrowserItemIndex(const LauncherModel& launcher_model);
 
+// Move the |maybe_panel| to the root window where the |event| occured if
+// |maybe_panel| is of aura::client::WINDOW_TYPE_PANEL and it's not
+// in the same root window.
+ASH_EXPORT void MoveToEventRootIfPanel(aura::Window* maybe_panel,
+                                       const ui::Event& event);
+
 }  // namespace launcher
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_UTIL_H_