Providing more information on why certain users can't be added to multi-profile

chrome/browser/ui/ash/session_state_delegate_chromeos.cc

 // Copyright (c) 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 "chrome/browser/ui/ash/session_state_delegate_chromeos.h"
 
 #include "ash/multi_profile_uma.h"
 #include "ash/session/session_state_observer.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/chromeos/login/lock/screen_locker.h"
 #include "chrome/browser/chromeos/login/ui/user_adding_screen.h"
+#include "chrome/browser/chromeos/login/users/multi_profile_user_controller.h"
 #include "chrome/browser/chromeos/login/users/user_manager.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager.h"
 #include "chrome/common/pref_names.h"
 #include "chromeos/chromeos_switches.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/session_manager_client.h"
 #include "chromeos/login/login_state.h"
@@ skipping 176 matching lines @@
       if (it == logged_in_users.begin())
         it = logged_in_users.end();
       user_id = (*(--it))->email();
       break;
   }
 
   // Switch using the transformed |user_id|.
   chromeos::UserManager::Get()->SwitchActiveUser(user_id);
 }
 
+bool SessionStateDelegateChromeos::IsMultiProfileAllowedByPrimaryUserPolicy()
+    const {
+  return chromeos::MultiProfileUserController::GetPrimaryUserPolicy() ==
+         chromeos::MultiProfileUserController::ALLOWED;
+}
+
 void SessionStateDelegateChromeos::AddSessionStateObserver(
     ash::SessionStateObserver* observer) {
   session_state_observer_list_.AddObserver(observer);
 }
 
 void SessionStateDelegateChromeos::RemoveSessionStateObserver(
     ash::SessionStateObserver* observer) {
   session_state_observer_list_.RemoveObserver(observer);
 }
 
@@ skipping 31 matching lines @@
 
   session_state_ = new_state;
   NotifySessionStateChanged();
 }
 
 void SessionStateDelegateChromeos::NotifySessionStateChanged() {
   FOR_EACH_OBSERVER(ash::SessionStateObserver,
                     session_state_observer_list_,
                     SessionStateChanged(session_state_));
 }