recipes: Fix missing patch_set property

infra/bots/recipes/swarm_trigger.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.
 
 
 # Recipe module for Skia Swarming trigger.
 
 
 import os
 import json
@@ skipping 197 matching lines @@
     'reason': 'Triggered by Skia swarm_trigger Recipe',
     'revision': got_revision,
     'slavename': slave,
     'swarm_out_dir': '${ISOLATED_OUTDIR}',
   }
   if builder_cfg['is_trybot']:
     if api.properties.get('patch_storage') == 'gerrit':
       properties['patch_storage'] = api.properties['patch_storage']
       properties['repository'] = api.properties['repository']
       properties['patch_ref'] = api.properties['patch_ref']
+      properties['patch_set'] = api.properties['patch_set']
       properties['patch_issue'] = api.properties['patch_issue']
     else:
       properties['issue'] = str(api.properties['issue'])
       properties['patchset'] = str(api.properties['patchset'])
       properties['rietveld'] = api.properties['rietveld']
 
   extra_args = [
       '--workdir', '../../..',
       recipe_name or 'swarm_%s' % task_name,
   ]
@@ skipping 535 matching lines @@
           path_config='kitchen',
           revision='abc123',
           **gerrit_kwargs) +
       api.step_data(
           'upload new .isolated file for test_skia',
           stdout=api.raw_io.output('def456 XYZ.isolated')) +
       api.step_data(
           'upload new .isolated file for upload_dm_results_skia',
           stdout=api.raw_io.output('def456 XYZ.isolated'))
   )