Bring back lost gamepad_seqlock_unittest.

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.
 
 {
   'variables': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 640 matching lines @@
         'common/dom_storage/dom_storage_map_unittest.cc',
         'common/fileapi/file_system_util_unittest.cc',
         'common/gpu/gpu_memory_manager_unittest.cc',
         'common/host_shared_bitmap_manager_unittest.cc',
         'common/indexed_db/indexed_db_key_unittest.cc',
         'common/input/input_param_traits_unittest.cc',
         'common/input/web_input_event_traits_unittest.cc',
         'common/inter_process_time_ticks_converter_unittest.cc',
         'common/mac/attributed_string_coder_unittest.mm',
         'common/mac/font_descriptor_unittest.mm',
+        'common/one_writer_seqlock_unittest.cc',
         '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/shareable_file_reference_unittest.cc',
         'common/webplugininfo_unittest.cc',
@@ skipping 1194 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }