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

chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_app.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 "chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_app.h"
 
 #include <vector>
 
 #include "ash/launcher/launcher_model.h"
 #include "ash/launcher/launcher_util.h"
@@ skipping 768 matching lines @@
     CreateNewWindow();
     return;
   }
 
   aura::Window* window = last_browser->window()->GetNativeWindow();
   window->Show();
   ash::wm::ActivateWindow(window);
 }
 
 void ChromeLauncherControllerPerApp::ItemClicked(const ash::LauncherItem& item,
-                                                 int event_flags) {
+                                                 const ui::Event& event) {
   DCHECK(HasItemController(item.id));
-  id_to_item_controller_map_[item.id]->Clicked();
+  id_to_item_controller_map_[item.id]->Clicked(event);
 }
 
 int ChromeLauncherControllerPerApp::GetBrowserShortcutResourceId() {
   return IDR_PRODUCT_LOGO_32;
 }
 
 string16 ChromeLauncherControllerPerApp::GetTitle(
     const ash::LauncherItem& item) {
   DCHECK(HasItemController(item.id));
   return id_to_item_controller_map_[item.id]->GetTitle();
@@ skipping 537 matching lines @@
     WebContents* web_contents =
         tab_strip->GetWebContentsAt(tab_strip->active_index());
     gfx::Image app_icon = GetAppListIcon(web_contents);
     items->push_back(new ChromeLauncherAppMenuItemBrowser(
                              web_contents->GetTitle(),
                              app_icon.IsEmpty() ? NULL : &app_icon,
                              browser));
   }
   return items;
 }