We should use UserID object to identify users instead of username.

chrome/browser/chromeos/login/session/chrome_session_manager.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/session/chrome_session_manager.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/sys_info.h"
@@ skipping 26 matching lines @@
 ChromeSessionManager::CreateSessionManager(
     const base::CommandLine& parsed_command_line,
     Profile* profile,
     bool is_running_test) {
   // Tests should be able to tune login manager before showing it. Thus only
   // show login UI (login and out-of-box) in normal (non-testing) mode with
   // --login-manager switch and if test passed --force-login-manager-in-tests.
   bool force_login_screen_in_test =
       parsed_command_line.HasSwitch(switches::kForceLoginManagerInTests);
 
-  std::string login_user_id =
-      parsed_command_line.GetSwitchValueASCII(switches::kLoginUser);
+  const user_manager::UserID login_user_id =

[Denis Kuznetsov (DE-MUC), 2015/06/10 16:50:45]

auto

+      user_manager::UserID::FromUserEmail(parsed_command_line.GetSwitchValueASCII(switches::kLoginUser));
 
   KioskAppManager::RemoveObsoleteCryptohomes();
 
   if (ShouldAutoLaunchKioskApp(parsed_command_line)) {
     VLOG(1) << "Starting Chrome with KioskAutoLauncherSessionManagerDelegate";
     return scoped_ptr<session_manager::SessionManager>(new ChromeSessionManager(
         new KioskAutoLauncherSessionManagerDelegate()));
   } else if (parsed_command_line.HasSwitch(switches::kLoginManager) &&
              (!is_running_test || force_login_screen_in_test)) {
     VLOG(1) << "Starting Chrome with LoginOobeSessionManagerDelegate";
     return scoped_ptr<session_manager::SessionManager>(
         new ChromeSessionManager(new LoginOobeSessionManagerDelegate()));
   } else if (!base::SysInfo::IsRunningOnChromeOS() &&
-             login_user_id == login::kStubUser) {
+             login_user_id == login::GetStubUserID()) {
     VLOG(1) << "Starting Chrome with StubLoginSessionManagerDelegate";
     return scoped_ptr<session_manager::SessionManager>(new ChromeSessionManager(
         new StubLoginSessionManagerDelegate(profile, login_user_id)));
   } else {
     VLOG(1) << "Starting Chrome with  RestoreAfterCrashSessionManagerDelegate";
     // Restarting Chrome inside existing user session. Possible cases:
     // 1. Chrome is restarted after crash.
     // 2. Chrome is restarted for Guest session.
     // 3. Chrome is started in browser_tests skipping the login flow.
     // 4. Chrome is started on dev machine i.e. not on Chrome OS device w/o
     //    login flow. In that case --login-user=[chromeos::login::kStubUser] is
     //    added. See PreEarlyInitialization().
     return scoped_ptr<session_manager::SessionManager>(new ChromeSessionManager(
         new RestoreAfterCrashSessionManagerDelegate(profile, login_user_id)));
   }
 }
 
 ChromeSessionManager::ChromeSessionManager(
     session_manager::SessionManagerDelegate* delegate) {
   Initialize(delegate);
 }
 
 ChromeSessionManager::~ChromeSessionManager() {
 }
 
 }  // namespace chromeos