[win] Initialize the app list menu lazily, and allow invalidation.

ui/app_list/views/search_box_view.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 UI_APP_LIST_VIEWS_SEARCH_BOX_VIEW_H_
 #define UI_APP_LIST_VIEWS_SEARCH_BOX_VIEW_H_
 
 #include <string>
 
 #include "ui/app_list/search_box_model_observer.h"
-#include "ui/app_list/views/app_list_menu_views.h"
 #include "ui/views/controls/button/menu_button_listener.h"
 #include "ui/views/controls/textfield/textfield_controller.h"
 #include "ui/views/view.h"
 
 namespace views {
 class ImageView;
 class MenuButton;
 class Textfield;
 }  // namespace views
 
 namespace app_list {
 
+class AppListMenuViews;
 class AppListViewDelegate;
 class SearchBoxModel;
 class SearchBoxViewDelegate;
 
 // SearchBoxView consists of an icon and a Textfield. SearchBoxModel is its data
 // model that controls what icon to display, what placeholder text to use for
 // Textfield. The text and selection model part could be set to change the
 // contents and selection model of the Textfield.
 class SearchBoxView : public views::View,
                       public views::TextfieldController,
                       public views::MenuButtonListener,
                       public SearchBoxModelObserver {
  public:
-  SearchBoxView(SearchBoxViewDelegate* delegate,
-                AppListViewDelegate* view_delegate);
+  explicit SearchBoxView(SearchBoxViewDelegate* delegate);
   virtual ~SearchBoxView();
 
   void SetModel(SearchBoxModel* model);
 
   bool HasSearch() const;
   void ClearSearch();
+  void UpdateMenu(AppListViewDelegate* view_delegate);
 
   views::Textfield* search_box() { return search_box_; }
 
   void set_contents_view(View* contents_view) {
     contents_view_ = contents_view;
   }
 
   // Overridden from views::View:
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual void Layout() OVERRIDE;
@@ skipping 18 matching lines @@
 
   // Overridden from SearchBoxModelObserver:
   virtual void IconChanged() OVERRIDE;
   virtual void HintTextChanged() OVERRIDE;
   virtual void SelectionModelChanged() OVERRIDE;
   virtual void TextChanged() OVERRIDE;
 
   SearchBoxViewDelegate* delegate_;  // Not owned.
   SearchBoxModel* model_;  // Owned by AppListModel.
 
-  AppListMenuViews menu_;
+  scoped_ptr<AppListMenuViews> menu_;
 
   views::ImageView* icon_view_;  // Owned by views hierarchy.
   views::MenuButton* menu_button_;  // Owned by views hierarchy.
   views::Textfield* search_box_;  // Owned by views hierarchy.
   views::View* contents_view_;  // Owned by views hierarchy.
 
   DISALLOW_COPY_AND_ASSIGN(SearchBoxView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_SEARCH_BOX_VIEW_H_