ExistingUserController is used for login under automation tests.

chrome/browser/chromeos/login/existing_user_controller.cc

 // Copyright (c) 2011 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/existing_user_controller.h"
 
 #include <algorithm>
 #include <functional>
 #include <map>
 
@@ skipping 525 matching lines @@
     bool pending_requests) {
   // LoginPerformer instance will delete itself once online auth result is OK.
   // In case of failure it'll bring up ScreenLock and ask for
   // correct password/display error message.
   // Even in case when following online,offline protocol and returning
   // requests_pending = false, let LoginPerformer delete itself.
   login_performer_->set_delegate(NULL);
   LoginPerformer* performer = login_performer_.release();
   performer = NULL;
   bool known_user = UserManager::Get()->IsKnownUser(username);
+  bool login_only =
+      CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+          switches::kLoginScreen) == WizardController::kLoginScreenName;
   AppendStartUrlToCmdline();
   controllers_[selected_view_index_]->StopThrobber();
-  if (selected_view_index_ + 1 == controllers_.size() && !known_user) {
+  if (selected_view_index_ + 1 == controllers_.size() &&
+      !known_user && !login_only) {
 #if defined(OFFICIAL_BUILD)
     CommandLine::ForCurrentProcess()->AppendSwitchPath(
         switches::kLoadExtension,
         FilePath(kGetStartedPath));
     CommandLine::ForCurrentProcess()->AppendArg(kGetStartedURL);
 #endif  // OFFICIAL_BUILD
     if (credentials.two_factor) {
       // If we have a two factor error and and this is a new user,
       // load the personal settings page.
       // TODO(stevenjb): direct the user to a lightweight sync login page.
@@ skipping 93 matching lines @@
     login_performer_->RecoverEncryptedData(old_password);
 }
 
 void ExistingUserController::ResyncEncryptedData() {
   // LoginPerformer instance has state of the user so it should exist.
   if (login_performer_.get())
     login_performer_->ResyncEncryptedData();
 }
 
 }  // namespace chromeos