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

ash/launcher/launcher_delegate.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_DELEGATE_H_
 #define ASH_LAUNCHER_LAUNCHER_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/launcher/launcher_types.h"
 #include "base/string16.h"
 
 namespace aura {
 class RootWindow;
 }
 
 namespace ui {
+class Event;
 class MenuModel;
 }
 
 namespace ash {
 
 // Delegate for the Launcher.
 class ASH_EXPORT LauncherDelegate {
  public:
   // Launcher owns the delegate.
   virtual ~LauncherDelegate() {}
 
   // Invoked when the user clicks on button in the launcher to open last used
   // window (or create a new one if there is no last used window).
   // |event_flags| is the flags of the click event.
   virtual void OnBrowserShortcutClicked(int event_flags) = 0;
 
   // Invoked when the user clicks on a window entry in the launcher.
-  // |event_flags| is the flags of the click event.
-  virtual void ItemClicked(const LauncherItem& item, int event_flags) = 0;
+  // |event| is the click event. The |event| is dispatched by a view
+  // and has an instance of |views::View| as the event target
+  // but not |aura::Window|.
+  virtual void ItemClicked(const LauncherItem& item,
+                           const ui::Event& event) = 0;
 
   // Returns the resource id of the image to show on the browser shortcut
   // button.
   virtual int GetBrowserShortcutResourceId() = 0;
 
   // Returns the title to display for the specified launcher item.
   virtual string16 GetTitle(const LauncherItem& item) = 0;
 
   // Returns the context menumodel for the specified item on
   // |root_window|.  Return NULL if there should be no context
@@ skipping 15 matching lines @@
   // there isn't one.
   virtual LauncherID GetIDByWindow(aura::Window* window) = 0;
 
   // Whether the given launcher item is draggable.
   virtual bool IsDraggable(const LauncherItem& item) = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_DELEGATE_H_