Enable telemetry --output-format=chartjson in recipes builds

scripts/slave/runtest.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """A tool used to run a Chrome test executable and process the output.
 
 This script is used by the buildbot slaves. It must be run from the outer
 build directory, e.g. chrome-release/build/.
 
@@ skipping 1565 matching lines @@
   Ensures that --output=chartjson is set and adds a --output argument.
 
   Arguments:
     args: list of command line arguments, starts with 'run_benchmark' for
           telemetry tests.
 
   Returns:
     None if not a telemetry test, otherwise a
     dict containing the output filename and whether it is a reference build.
   """
-  # TODO(sullivan): remove this line to enable new telemetry chartjson.
-  # W0101: unreachable code. Disable this check until we're able to remove this
-  # line entirely.
-  # pylint: disable=W0101
-  return {}
   if not args[0].endswith('run_benchmark'):
     # Not a telemetry run
     return None
 
   is_ref = '--browser=reference' in args
 
   if '--output-format=buildbot' in args:
     args[args.index('--output-format=buildbot')] = '--output-format=chartjson'
   # Using NamedTemporaryFile instead of mkstemp because of windows issues
   # with mkstemp.
@@ skipping 405 matching lines @@
   finally:
     if did_launch_dbus:
       # It looks like the command line argument --exit-with-session
       # isn't working to clean up the spawned dbus-daemon. Kill it
       # manually.
       _ShutdownDBus()
 
 
 if '__main__' == __name__:
   sys.exit(main())