Creating supervised users restricted for regular users if they are supervised.

chrome/browser/chromeos/login/users/chrome_user_manager.h

 // Copyright 2014 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 CHROME_BROWSER_CHROMEOS_LOGIN_USERS_CHROME_USER_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USERS_CHROME_USER_MANAGER_H_
 
 #include "base/basictypes.h"
+#include "components/user_manager/user.h"
 #include "components/user_manager/user_manager_base.h"
 
 namespace base {
 class TaskRunner;
 }
 
 namespace chromeos {
 
 class MultiProfileUserController;
 class SupervisedUserManager;
 class UserFlow;
 class UserImageManager;
 
 // Chrome specific interface of the UserManager.
 class ChromeUserManager : public user_manager::UserManagerBase {
  public:
   ChromeUserManager(scoped_refptr<base::TaskRunner> task_runner,
                     scoped_refptr<base::TaskRunner> blocking_task_runner);
   virtual ~ChromeUserManager();
 
   // Returns current ChromeUserManager or NULL if instance hasn't been
   // yet initialized.
   static ChromeUserManager* Get();
 
+  // Helper method for sorting out of user list only users that can create
+  // supervised users.
+  static user_manager::UserList GetUsersAllowedAsSupervisedUserManagers(
+      const user_manager::UserList& user_list);
+
   virtual MultiProfileUserController* GetMultiProfileUserController() = 0;
   virtual UserImageManager* GetUserImageManager(const std::string& user_id) = 0;
   virtual SupervisedUserManager* GetSupervisedUserManager() = 0;
 
   // Method that allows to set |flow| for user identified by |user_id|.
   // Flow should be set before login attempt.
   // Takes ownership of the |flow|, |flow| will be deleted in case of login
   // failure.
   virtual void SetUserFlow(const std::string& user_id, UserFlow* flow) = 0;
 
   // Return user flow for current user. Returns instance of DefaultUserFlow if
   // no flow was defined for current user, or user is not logged in.
   // Returned value should not be cached.
   virtual UserFlow* GetCurrentUserFlow() const = 0;
 
   // Return user flow for user identified by |user_id|. Returns instance of
   // DefaultUserFlow if no flow was defined for user.
   // Returned value should not be cached.
   virtual UserFlow* GetUserFlow(const std::string& user_id) const = 0;
 
   // Resets user flow for user identified by |user_id|.
   virtual void ResetUserFlow(const std::string& user_id) = 0;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeUserManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USERS_CHROME_USER_MANAGER_H_