[ash] Add TYPE_DIALOG and its item's LauncherContextMenu

ash/shelf/shelf_window_watcher_item_delegate.cc

 // Copyright 2013 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/shelf/shelf_window_watcher_item_delegate.h"
 
+#include "ash/shelf/shelf_item_context_menu.h"
 #include "ash/shelf/shelf_util.h"
 #include "ash/wm/window_state.h"
 #include "ui/aura/window.h"
 #include "ui/views/corewm/window_animations.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 namespace internal {
 
 ShelfWindowWatcherItemDelegate::ShelfWindowWatcherItemDelegate(
@@ skipping 23 matching lines @@
 
   return false;
 }
 
 base::string16 ShelfWindowWatcherItemDelegate::GetTitle() {
   return GetLauncherItemDetailsForWindow(window_)->title;
 }
 
 ui::MenuModel* ShelfWindowWatcherItemDelegate::CreateContextMenu(
     aura::Window* root_window) {
-  // TODO(simonhong): Create ShelfItemContextMenu.
-  return NULL;
+  return new ShelfItemContextMenu(this, root_window);
 }
 
 ShelfMenuModel* ShelfWindowWatcherItemDelegate::CreateApplicationMenu(
     int event_flags) {
   return NULL;
 }
 
 bool ShelfWindowWatcherItemDelegate::IsDraggable() {
   return true;
 }
 
 bool ShelfWindowWatcherItemDelegate::ShouldShowTooltip() {
   return true;
 }
 
 }  // namespace internal
 }  // namespace ash