Adding perf test isolate and gn build target for swarming the benchmarks.

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 128 matching lines @@
   'cast_media_unittests',
   'cast_shell_browser_test',
   'chromevox_tests',
   'nacl_helper_nonsfi_unittests',
 
   # TODO(kbr): teach this script about isolated_scripts tests.
   # crbug.com/620531
   'telemetry_gpu_integration_test',
   'telemetry_gpu_test',
   'telemetry_gpu_unittests',
+  'telemetry_perf_tests',
   'telemetry_perf_unittests',
   'telemetry_unittests',
 }
 
 
 class Error(Exception):
   """Processing error."""
 
 
 def get_isolates():
@@ skipping 232 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())