Adds API test for imageWriterPrivate.writeFromFile

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 1086 matching lines @@
         'browser/extensions/api/font_settings/font_settings_apitest.cc',
         'browser/extensions/api/gcm/gcm_apitest.cc',
         'browser/extensions/api/gcd_private/gcd_private_apitest.cc',
         'browser/extensions/api/history/history_apitest.cc',
         'browser/extensions/api/hotword_private/hotword_private_apitest.cc',
         'browser/extensions/api/i18n/i18n_apitest.cc',
         'browser/extensions/api/identity/identity_apitest.cc',
         'browser/extensions/api/idle/idle_apitest.cc',
         'browser/extensions/api/idltest/idltest_apitest.cc',
         'browser/extensions/api/image_writer_private/image_writer_private_apitest.cc',
+        'browser/extensions/api/image_writer_private/test_utils.cc',
         'browser/extensions/api/input_ime/input_ime_apitest_chromeos.cc',
         'browser/extensions/api/management/management_api_browsertest.cc',
         'browser/extensions/api/management/management_apitest.cc',
         'browser/extensions/api/management/management_browsertest.cc',
         'browser/extensions/api/mdns/mdns_apitest.cc',
         'browser/extensions/api/media_galleries/media_galleries_apitest.cc',
         'browser/extensions/api/media_galleries_private/media_galleries_watch_apitest.cc',
         'browser/extensions/api/messaging/native_messaging_apitest.cc',
         'browser/extensions/api/metrics_private/metrics_apitest.cc',
         'browser/extensions/api/module/module_apitest.cc',
@@ skipping 1869 matching lines @@
             ['enable_webrtc==1', {
               'dependencies': [
                 '../third_party/libjingle/libjingle.gyp:libjingle_webrtc'
               ]
             }],
           ],
         }]
     }],
   ],  # 'conditions'
 }