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

chrome/browser/ui/ash/launcher/shell_window_launcher_item_controller.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/shell_window_launcher_item_controller.h"
 
+#include "ash/launcher/launcher_util.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item_v2app.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_app.h"
 #include "chrome/browser/ui/ash/launcher/launcher_item_controller.h"
 #include "chrome/browser/ui/extensions/native_app_window.h"
 #include "chrome/browser/ui/extensions/shell_window.h"
 
 namespace {
 
@@ skipping 91 matching lines @@
        iter != windows_to_close.end(); ++iter) {
     (*iter)->GetBaseWindow()->Close();
   }
 }
 
 // Behavior for app windows:
 // * One window: Toggle minimization when clicked.
 // * Multiple windows:
 // ** If the first window is not active, activate it.
 // ** Otherwise activate the next window.
-void ShellWindowLauncherItemController::Clicked() {
+void ShellWindowLauncherItemController::Clicked(const ui::Event& event) {
   if (shell_windows_.empty())
     return;
   ShellWindow* first_window = shell_windows_.front();
   if (shell_windows_.size() == 1) {
+    ash::launcher::MoveToEventRootIfPanel(first_window->GetNativeWindow(),
+                                          event);
+    // If the window moves, it becomes inactive first then
+    // gets activated.

[stevenjb, 2013/01/31 20:23:40]

nit: 'then gets activated later'?

[oshima, 2013/01/31 20:37:41]

changed to "then gets activated in |RestoreOrShow| before.

     if (first_window->GetBaseWindow()->IsActive())
       first_window->GetBaseWindow()->Minimize();
     else
       RestoreOrShow(first_window);
   } else {
     if (!first_window->GetBaseWindow()->IsActive()) {
       RestoreOrShow(first_window);
     } else {
       shell_windows_.pop_front();
       shell_windows_.push_back(first_window);
@@ skipping 52 matching lines @@
 
 void ShellWindowLauncherItemController::RestoreOrShow(
     ShellWindow* shell_window) {
   if (shell_window->GetBaseWindow()->IsMinimized())
     shell_window->GetBaseWindow()->Restore();
   else
     shell_window->GetBaseWindow()->Show();
   // Always activate windows when shown from the launcher.
   shell_window->GetBaseWindow()->Activate();
 }