First step to move common accessibility code out of content.

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',
       'dependencies': [
@@ skipping 468 matching lines @@
         'browser/webui/web_ui_data_source_unittest.cc',
         'browser/webui/web_ui_message_handler_unittest.cc',
         'child/fileapi/webfilewriter_base_unittest.cc',
         'child/indexed_db/indexed_db_dispatcher_unittest.cc',
         'child/indexed_db/proxy_webidbcursor_impl_unittest.cc',
         'child/npapi/plugin_lib_unittest.cc',
         'child/power_monitor_broadcast_source_unittest.cc',
         'child/resource_dispatcher_unittest.cc',
         'child/site_isolation_policy_unittest.cc',
         'common/android/address_parser_unittest.cc',
+        'common/ax_tree_unittest.cc',
         'common/cc_messages_unittest.cc',
         'common/common_param_traits_unittest.cc',
         'common/dom_storage/dom_storage_map_unittest.cc',
         'common/gpu/gpu_memory_manager_unittest.cc',
         'common/indexed_db/indexed_db_key_unittest.cc',
         'common/input/input_param_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/page_state_serialization_unittest.cc',
@@ skipping 1097 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }