Add a basic demo mode browser test.

chrome/chrome_tests.gypi

 # Copyright 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 996 matching lines @@
         'browser/chromeos/file_manager/file_manager_jstest.cc',
         'browser/chromeos/file_manager/zip_file_creator_browsertest.cc',
         'browser/chromeos/first_run/drive_first_run_browsertest.cc',
         'browser/chromeos/first_run/first_run_browsertest.cc',
         'browser/chromeos/input_method/input_method_engine_browsertests.cc',
         'browser/chromeos/input_method/mode_indicator_browsertest.cc',
         'browser/chromeos/kiosk_mode/mock_kiosk_mode_settings.cc',
         'browser/chromeos/kiosk_mode/mock_kiosk_mode_settings.h',
         'browser/chromeos/login/captive_portal_window_browsertest.cc',
         'browser/chromeos/login/crash_restore_browsertest.cc',
+        'browser/chromeos/login/demo_mode/demo_app_launcher_browsertest.cc',
         'browser/chromeos/login/enrollment/enrollment_screen_browsertest.cc',
         'browser/chromeos/login/enrollment/mock_enrollment_screen.cc',
         'browser/chromeos/login/enrollment/mock_enrollment_screen.h',
         'browser/chromeos/login/existing_user_controller_browsertest.cc',
         'browser/chromeos/login/kiosk_browsertest.cc',
         'browser/chromeos/login/login_screen_policy_browsertest.cc',
         'browser/chromeos/login/login_utils_browsertest.cc',
         'browser/chromeos/login/login_manager_test.cc',
         'browser/chromeos/login/login_manager_test.h',
         'browser/chromeos/login/managed/supervised_user_creation_browsertest.cc',
@@ skipping 2207 matching lines @@
             'utility',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
           ],
         }]
     }],
   ],  # 'conditions'
 }