Update app list search box menu when Users changes

ui/app_list/app_list_view_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 UI_APP_LIST_APP_LIST_VIEW_DELEGATE_H_
 #define UI_APP_LIST_APP_LIST_VIEW_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/files/file_path.h"
+#include "base/observer_list.h"
 #include "base/strings/string16.h"
 #include "ui/app_list/app_list_export.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace content {
 class WebContents;
 }
 
 namespace gfx {
 class ImageSkia;
 }
 
 namespace app_list {
 
 class AppListItemModel;
 class AppListModel;
+class AppListViewDelegateObserver;
 class SearchResult;
 class SigninDelegate;
 
 class APP_LIST_EXPORT AppListViewDelegate {
  public:
   // A user of the app list.
   struct APP_LIST_EXPORT User {
     User();
     ~User();
 
     // Whether or not this user is the current user of the app list.
     bool active;
 
     // The name of this user.
     base::string16 name;
 
     // The email address of this user.
     base::string16 email;
 
     // The path to this user's profile directory.
     base::FilePath profile_path;
   };
   typedef std::vector<User> Users;
 
+  AppListViewDelegate() {}

[tapted, 2013/11/22 00:03:19]

heads-up clang will probably complain about this and the destructor not having a
separate definition in the .cc (but maybe moot anyway)

+
   // AppListView owns the delegate.
   virtual ~AppListViewDelegate() {}
 
   // Whether to force the use of a native desktop widget when the app list
   // window is first created.
   virtual bool ForceNativeDesktop() const = 0;
 
   // Sets the delegate to use the profile at |profile_path|. This is currently
   // only used by non-Ash Windows.
   virtual void SetProfileByPath(const base::FilePath& profile_path) = 0;
@@ skipping 50 matching lines @@
   // Invoked to toggle the status of speech recognition.
   virtual void ToggleSpeechRecognition() = 0;
 
   // Shows the app list for the profile specified by |profile_path|.
   virtual void ShowForProfileByPath(const base::FilePath& profile_path) = 0;
 
   // Get the start page web contents. Owned by the AppListViewDelegate.
   virtual content::WebContents* GetStartPageContents() = 0;
 
   // Returns the list of users (for AppListMenu).
-  virtual const Users& GetUsers() const = 0;
+  const Users& GetUsers() const;
+
+  void AddObserver(AppListViewDelegateObserver* observer);
+  void RemoveObserver(AppListViewDelegateObserver* observer);
+
+ protected:
+  void NotifyUsersChanged();
+
+  Users users_;
+  ObserverList<AppListViewDelegateObserver> observers_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AppListViewDelegate);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_APP_LIST_VIEW_DELEGATE_H_