[Findit] Fix bug when displaying try job result for swamring tests.

appengine/findit/waterfall/trigger_swarming_task_pipeline.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.
 
 import copy
 from datetime import datetime
 import logging
 import time
 
 from google.appengine.ext import ndb
@@ skipping 140 matching lines @@
 
     # 3. Trigger a new Swarming task to re-run the failed tests.
     task_id = swarming_util.TriggerSwarmingTask(new_request, http_client)
 
     # Save the task id.
     swarming_task = WfSwarmingTask.Get(
         master_name, builder_name, build_number, step_name)
     swarming_task.task_id = task_id
     swarming_task.parameters['tests'] = tests
     swarming_task.parameters['iterations_to_rerun'] = iterations_to_rerun
+    swarming_task.parameters['ref_name'] = swarming_util.GetTagValue(
+        new_request.tags, 'ref_name')
     swarming_task.put()
 
     logging.info('A Swarming task was triggered:%s', task_id)
     return task_id