Add wallpaper api tests

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' : {
     'chromedriver_unittest_sources': [
       'test/chromedriver/capabilities_unittest.cc',
       'test/chromedriver/chrome/chrome_finder_unittest.cc',
       'test/chromedriver/chrome/console_logger_unittest.cc',
       'test/chromedriver/chrome/device_manager_unittest.cc',
@@ skipping 1014 matching lines @@
         'browser/chromeos/drive/test_util.cc',
         'browser/chromeos/drive/test_util.h',
         'browser/chromeos/extensions/screenlock_private_apitest.cc',
         'browser/chromeos/extensions/echo_private_apitest.cc',
         'browser/chromeos/extensions/file_manager/file_browser_handler_api_test.cc',
         'browser/chromeos/extensions/file_manager/file_browser_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/virtual_keyboard_browsertest.cc',
+        'browser/chromeos/extensions/wallpaper_apitest.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 2180 matching lines @@
             'utility',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
           ],
         }]
     }],
   ],  # 'conditions'
 }