Create a new GN target //services/service_junit_tests, and enable it in bots.

testing/buildbot/manage.py

 #!/usr/bin/env python
 # Copyright 2015 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.
 
 """Toolbox to manage all the json files in this directory.
 
 It can reformat them in their canonical format or ensures they are well
 formatted.
 """
@@ skipping 165 matching lines @@
   'components_web_restrictions_junit_tests',
   'content_junit_tests',
   'content_junit_tests',
   'device_junit_tests',
   'junit_unit_tests',
   'media_router_perf_tests',
   'media_router_tests',
   'motopho_latency_test',
   'net_junit_tests',
   'net_junit_tests',
+  'service_junit_tests',
   'ui_junit_tests',
   'webapk_client_junit_tests',
   'webapk_shell_apk_junit_tests',
 
   # These tests are only run on WebRTC CI.
   'AppRTCMobileTest',
   'android_junit_tests',
   'audio_decoder_unittests',
   'common_audio_unittests',
   'common_video_unittests',
@@ skipping 295 matching lines @@
     elif args.mode == 'remaining':
       print_remaining(args.test_name, tests_location)
     return result
   except Error as e:
     sys.stderr.write('%s\n' % e)
     return 1
 
 
 if __name__ == "__main__":
   sys.exit(main())