Add a basic demo mode browser test.

chrome/browser/chromeos/login/parallel_authenticator.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/parallel_authenticator.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
@@ skipping 328 matching lines @@
   remove_user_data_on_failure_ = false;
   ephemeral_mount_attempted_ = true;
   SystemSaltGetter::Get()->GetSystemSalt(
       base::Bind(&Mount,
                  current_state_.get(),
                  scoped_refptr<ParallelAuthenticator>(this),
                  cryptohome::CREATE_IF_MISSING | cryptohome::ENSURE_EPHEMERAL));
 }
 
 void ParallelAuthenticator::LoginAsKioskAccount(
-    const std::string& app_user_id, bool force_ephemeral) {
+    const std::string& app_user_id, bool force_guest) {

[bartfab (slow), 2014/03/20 13:22:29]

Nit: Put each argument on a separate line.

[rkc, 2014/03/20 21:45:01]

Done.

   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
-  std::string user_id =
-      force_ephemeral ? UserManager::kGuestUserName : app_user_id;
+  const std::string user_id =
+      force_guest ? UserManager::kGuestUserName : app_user_id;
   current_state_.reset(new AuthAttemptState(
       UserContext(user_id,
                   std::string(),  // password
                   std::string()),  // auth_code
       std::string(),  // login_token
       std::string(),  // login_captcha
       User::USER_TYPE_KIOSK_APP,
       false));
 
   remove_user_data_on_failure_ = true;
-  if (!force_ephemeral) {
+  if (!force_guest) {
     MountPublic(current_state_.get(),
           scoped_refptr<ParallelAuthenticator>(this),
           cryptohome::CREATE_IF_MISSING);
   } else {
     ephemeral_mount_attempted_ = true;
     MountGuest(current_state_.get(),
                scoped_refptr<ParallelAuthenticator>(this));
   }
 }
 
@@ skipping 441 matching lines @@
   Resolve();
 }
 
 void ParallelAuthenticator::SetOwnerState(bool owner_check_finished,
                                           bool check_result) {
   owner_is_verified_ = owner_check_finished;
   user_can_login_ = check_result;
 }
 
 }  // namespace chromeos