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

ash/launcher/launcher.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/launcher/launcher.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "ash/focus_cycler.h"
@@ skipping 343 matching lines @@
   views::View::ConvertPointToScreen(launcher_view_, &screen_origin);
   return gfx::Rect(screen_origin.x() + bounds.x(),
                    screen_origin.y() + bounds.y(),
                    bounds.width(),
                    bounds.height());
 }
 
 void Launcher::ActivateLauncherItem(int index) {
   const ash::LauncherItems& items =
       launcher_view_->model()->items();
-  delegate_->ItemClicked(items[index], ui::EF_NONE);
+  ui::MouseEvent event(ui::ET_MOUSE_PRESSED,
+                       gfx::Point(),
+                       gfx::Point(),
+                       ui::EF_NONE);
+  delegate_->ItemClicked(items[index], event);
 }
 
 void Launcher::CycleWindowLinear(CycleDirection direction) {
   int item_index = GetNextActivatedItemIndex(
       *(launcher_view_->model()), direction);
   if (item_index >= 0)
     ActivateLauncherItem(item_index);
 }
 
 void Launcher::AddIconObserver(LauncherIconObserver* observer) {
@@ skipping 65 matching lines @@
   } else {
     delegate_view_->GetFocusManager()->ClearFocus();
   }
 }
 
 internal::LauncherView* Launcher::GetLauncherViewForTest() {
   return launcher_view_;
 }
 
 }  // namespace ash