PRESUBMIT: use "master." prefix in CQ_INCLUDE_TRYBOTS.

tools/perf/PRESUBMIT.py

 # Copyright 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.
 
 """Presubmit script for changes affecting tools/perf/.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into depot_tools.
 """
 
@@ skipping 113 matching lines @@
       r'^CQ_INCLUDE_TRYBOTS=.*', original_description, re.M | re.I):
     return []
 
   results = []
   bots = [
     'android_s5_perf_cq',
     'mac_retina_perf_cq',
     # TODO(prasadv): Uncomment this once crbug.com/601699 is fixed.
     # 'linux_perf_cq'
   ]
-  bots = ['tryserver.chromium.perf:%s' % s for s in bots]
+  bots = ['master.tryserver.chromium.perf:%s' % s for s in bots]
   bots_string = ';'.join(bots)
   description = original_description
   description += '\nCQ_INCLUDE_TRYBOTS=%s' % bots_string
   results.append(output_api.PresubmitNotifyResult(
       'Automatically added Perf trybots to run Telemetry benchmarks on CQ.'))
 
   if description != original_description:
     rietveld_obj.update_description(issue, description)
 
   return results