[cros] Fake a stub user login when no --login-manager and --login-user are given.

chrome/browser/chromeos/login/wizard_in_process_browser_test.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/wizard_in_process_browser_test.h"
 
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "chrome/browser/chromeos/login/base_login_display_host.h"
 #include "chrome/browser/chromeos/login/login_wizard.h"
 #include "chrome/browser/chromeos/login/wizard_controller.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/notification_service.h"
 
 namespace chromeos {
 
 WizardInProcessBrowserTest::WizardInProcessBrowserTest(const char* screen_name)
     : screen_name_(screen_name),
       host_(NULL) {
 }
 
 void WizardInProcessBrowserTest::SetUpCommandLine(CommandLine* command_line) {
   command_line->AppendSwitch(switches::kNoStartupWindow);
+  command_line->AppendSwitch(switches::kLoginManager);
 }
 
 void WizardInProcessBrowserTest::SetUpOnMainThread() {
   SetUpWizard();
 
   WizardController::SetZeroDelays();
 
   if (!screen_name_.empty()) {
     ShowLoginWizard(screen_name_, gfx::Size(1024, 600));
     host_ = BaseLoginDisplayHost::default_host();
   }
 }
 
 void WizardInProcessBrowserTest::CleanUpOnMainThread() {
   // LoginDisplayHost owns controllers and all windows.
   MessageLoopForUI::current()->DeleteSoon(FROM_HERE, host_);
 
   ui_test_utils::RunMessageLoop();
 }
 
 }  // namespace chromeos