Test wallpaper picker app could launch in dev and stable channel

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.
 {
   'includes': [
     'js_unittest_vars.gypi',
   ],
   'targets': [
     {
       'target_name': 'interactive_ui_tests',
@@ skipping 941 matching lines @@
         'browser/chromeos/extensions/echo_private_apitest.cc',
         'browser/chromeos/extensions/file_manager/file_browser_handler_api_test.cc',
         'browser/chromeos/extensions/file_manager/file_manager_private_apitest.cc',
         'browser/chromeos/extensions/file_system_provider/file_system_provider_apitest.cc',
         'browser/chromeos/extensions/info_private_apitest.cc',
         'browser/chromeos/extensions/input_method_apitest_chromeos.cc',
         'browser/chromeos/extensions/input_view_browsertest.cc',
         'browser/chromeos/extensions/virtual_keyboard_browsertest.cc',
         'browser/chromeos/extensions/virtual_keyboard_browsertest.h',
         'browser/chromeos/extensions/wallpaper_apitest.cc',
+        'browser/chromeos/extensions/wallpaper_manager_browsertest.cc',
         'browser/chromeos/extensions/wallpaper_private_apitest.cc',
         'browser/chromeos/file_manager/drive_test_util.cc',
         'browser/chromeos/file_manager/drive_test_util.h',
         'browser/chromeos/file_manager/external_filesystem_apitest.cc',
         'browser/chromeos/file_manager/file_manager_browsertest.cc',
         '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',
@@ skipping 2091 matching lines @@
             ['enable_webrtc==1', {
               'dependencies': [
                 '../third_party/libjingle/libjingle.gyp:libjingle_webrtc'
               ]
             }],
           ],
         }]
     }],
   ],  # 'conditions'
 }