[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_model.h"
 #include "ash/shelf/shelf_util.h"
+#include "ash/shell.h"
+#include "ash/shell_delegate.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(
-    aura::Window* window)
-    : window_(window) {
+    aura::Window* window, ShelfModel* model)
+    : window_(window),
+      model_(model) {
 }
 
 ShelfWindowWatcherItemDelegate::~ShelfWindowWatcherItemDelegate() {
 }
 
 void ShelfWindowWatcherItemDelegate::Close() {
   views::Widget::GetWidgetForNativeWindow(window_)->Close();
 }
 
 bool ShelfWindowWatcherItemDelegate::ItemSelected(const ui::Event& event) {
@@ skipping 11 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;
+  ash::LauncherItem item =
+      *(model_->ItemByID(GetLauncherIDForWindow(window_)));
+  return Shell::GetInstance()->delegate()->CreateContextMenu(root_window,
+                                                             this,
+                                                             &item);
 }
 
 ShelfMenuModel* ShelfWindowWatcherItemDelegate::CreateApplicationMenu(
     int event_flags) {
   return NULL;
 }
 
 bool ShelfWindowWatcherItemDelegate::IsDraggable() {
   return true;
 }
 
 bool ShelfWindowWatcherItemDelegate::ShouldShowTooltip() {
   return true;
 }
 
 }  // namespace internal
 }  // namespace ash