Add decorations to bot names for modifying parts of try sets.

scripts/master/try_job_base_bb7.py

 # Copyright (c) 2011 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 os
 
 from buildbot import buildset
 from buildbot.changes.changes import Change
 from buildbot.scheduler import BadJobfile
 from buildbot.scheduler import TryBase  # pylint: disable=W0611
 from twisted.python import log
 from twisted.web import http
 
 from master.try_job_stamp import TryJobStamp
+import master.try_job_decoration as decor
 
 
 class TryJobBaseMixIn:
   def __init__(self):
     pass
 
   def ParseJob(self, options):
     """Grab try job settings."""
     options = self.parse_options(options)
     fake_changes = [
@@ skipping 74 matching lines @@
     except BadJobfile:
       log.msg('%s reports a bad job connection' % (self))
       log.err()
       return http.BAD_REQUEST
     reason = "'%s' try job" % buildset_id
     # Send one build request per builder, otherwise the cancelation logic
     # doesn't work.
     build_sets = []
     for builder_name in builder_names:
       build_set = buildset.BuildSet(
-          [builder_name],
+          builder_name.split(':')[0:1],
           jobstamp,
           reason=reason,
           bsid=buildset_id,
-          properties=props)
+          properties=decor.parse_decoration(props,
+              ':'.join(builder_name.split(':')[1:])))
       build_sets.append(build_set)
       self.CancelJobsMatching(build_set, builder_name)
     for build_set in build_sets:
       # Type inference error.
       # pylint: disable=E1101
       self.parent.submitBuildSet(build_set)
     return http.OK