Run the later parts of startup as UI thread tasks

content/content_tests.gypi

 # Copyright (c) 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.
 
 {
   'targets': [
     {
       'target_name': 'test_support_content',
       'type': 'static_library',
       'defines!': ['CONTENT_IMPLEMENTATION'],
@@ skipping 387 matching lines @@
         'common/mac/attributed_string_coder_unittest.mm',
         'common/mac/font_descriptor_unittest.mm',
         'common/page_state_serialization_unittest.cc',
         'common/page_zoom_unittest.cc',
         'common/plugin_list_unittest.cc',
         'common/sandbox_mac_diraccess_unittest.mm',
         'common/sandbox_mac_fontloading_unittest.mm',
         'common/sandbox_mac_system_access_unittest.mm',
         'common/sandbox_mac_unittest_helper.h',
         'common/sandbox_mac_unittest_helper.mm',
+        'common/startup_task_runner_unittest.cc',
         'common/webplugininfo_unittest.cc',
         'renderer/active_notification_tracker_unittest.cc',
         'renderer/android/email_detector_unittest.cc',
         'renderer/android/phone_number_detector_unittest.cc',
         'renderer/bmp_image_decoder_unittest.cc',
         'renderer/date_time_formatter_unittest.cc',
         'renderer/device_orientation/device_motion_event_pump_unittest.cc',
         'renderer/disambiguation_popup_helper_unittest.cc',
         'renderer/gpu/input_event_filter_unittest.cc',
         'renderer/gpu/input_handler_proxy_unittest.cc',
@@ skipping 975 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }