git_hash_metric: added missing ts_mon option

scripts/slave/recipes/infra/git_hash_metric.py

 # Copyright 2016 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.
 
 from recipe_engine.recipe_api import Property
 
 DEPS = [
     'recipe_engine/properties',
     'recipe_engine/python',
 ]
 
 
 def RunSteps(api):
   git_revision = api.properties['git_revision']
   repository = api.properties['repository']
 
   api.python(
     'send hash to ts_mon',
     '/opt/infra-python/run.py',
     ['infra.tools.send_ts_mon_values',
      '--verbose',
      '--ts-mon-target-type=task',
      '--ts-mon-task-service-name=git_hash_metric',
+     '--ts-mon-task-job-name=default',
      ('--string=\'{"name":"repository/hash", '
       '"value": "%s", "repository": "%s"}\'' % (git_revision, repository)),
    ]
   )
 
 
 def GenTests(api):
   yield (api.test('infra') +
          api.properties.git_scheduled(
            git_revision='deadbeefdeadbeefdeadbeefdeadbeefdeadbeef',
            repository='https://chromium.googlesource.com/infra/infra'
          )
   )