Enable accessibility testing for the bookmark browser test.

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': {
     'chrome_browser_extensions_test_support_sources': [
       # A list of sources which is shared between different browser tests.
       'browser/apps/app_browsertest_util.cc',
       'browser/apps/app_browsertest_util.h',
       'browser/extensions/browsertest_util.cc',
@@ skipping 518 matching lines @@
       'renderer/autofill/form_autocomplete_browsertest.cc',
       'renderer/autofill/form_autofill_browsertest.cc',
       'renderer/autofill/page_click_tracker_browsertest.cc',
       'renderer/autofill/password_autofill_agent_browsertest.cc',
       'renderer/autofill/password_generation_agent_browsertest.cc',
       'renderer/content_settings_observer_browsertest.cc',
       'renderer/media/cast_session_browsertest.cc',
       'renderer/printing/print_web_view_helper_browsertest.cc',
       'renderer/translate/translate_helper_browsertest.cc',
       'renderer/translate/translate_script_browsertest.cc',
+      'test/base/accessibility_test_helper_test.cc',
       'test/base/chrome_render_view_test.cc',
       'test/base/chrome_render_view_test.h',
       'test/base/web_ui_browser_test.cc',
       'test/base/web_ui_browser_test.h',
       'test/base/web_ui_browser_test_browsertest.cc',
       'test/base/in_process_browser_test_browsertest.cc',
       'test/base/javascript_browser_test.cc',
       'test/base/javascript_browser_test.h',
       'test/base/tracing_browsertest.cc',
       'test/base/test_chrome_web_ui_controller_factory.cc',
@@ skipping 2690 matching lines @@
             ['enable_webrtc==1', {
               'dependencies': [
                 '../third_party/libjingle/libjingle.gyp:libjingle_webrtc'
               ]
             }],
           ],
         }]
     }],
   ],  # 'conditions'
 }