[ash] Add TYPE_DIALOG and its item's LauncherContextMenu

ash/shell_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_SHELL_DELEGATE_H_
 #define ASH_SHELL_DELEGATE_H_
 
 #include <string>
 
 #include "ash/ash_export.h"
@@ skipping 31 matching lines @@
 
 namespace ash {
 
 class AccessibilityDelegate;
 class CapsLockDelegate;
 class MediaDelegate;
 class NewWindowDelegate;
 class WindowTreeHostFactory;
 class SessionStateDelegate;
 class ShelfDelegate;
+class ShelfItemDelegate;
 class ShelfModel;
 class SystemTrayDelegate;
 class UserWallpaperDelegate;
 struct LauncherItem;
 
 // Delegate of the Shell.
 class ASH_EXPORT ShellDelegate {
  public:
   // The Shell owns the delegate.
   virtual ~ShellDelegate() {}
@@ skipping 57 matching lines @@
   // Creates an application delegate. Shell takes ownership of the delegate.
   virtual NewWindowDelegate* CreateNewWindowDelegate() = 0;
 
   // Creates a media delegate. Shell takes ownership of the delegate.
   virtual MediaDelegate* CreateMediaDelegate() = 0;
 
   // Creates a user action client. Shell takes ownership of the object.
   virtual aura::client::UserActionClient* CreateUserActionClient() = 0;
 
   // Creates a menu model of the context for the |root_window|.
-  virtual ui::MenuModel* CreateContextMenu(aura::Window* root_window) = 0;
+  // When a ContextMenu is used for an item created by ShelfWindowWatcher,
+  // passes its ShelfItemDelegate and LauncherItem.
+  virtual ui::MenuModel* CreateContextMenu(
+      aura::Window* root_window,
+      ash::ShelfItemDelegate* item_delegate,
+      ash::LauncherItem* item) = 0;
 
   // Creates a root window host factory. Shell takes ownership of the returned
   // value.
   virtual WindowTreeHostFactory* CreateWindowTreeHostFactory() = 0;
 
   // Get the product name.
   virtual base::string16 GetProductName() const = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_DELEGATE_H_