Rietveld: schedule presubmit tryjobs with dry_run property.

appengine/chromium_rietveld/codereview/buildbucket.py

 # Copyright 2008 Google Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 236 matching lines @@
 
     properties = build.get('properties') or {}
     properties.update({
       'issue': issue.key.id(),
       'master': build['master'],
       'patch_project': issue.project,
       'patch_storage': 'rietveld',
       'patchset': patchset_id,
       'rietveld': 'https://%s' % self_hostname,
     })
+    if 'presubmit' in build['builder'].lower():
+      properties['dry_run'] = 'true'
     req['builds'].append({
         'bucket': 'master.%s' % build['master'],
         'parameters_json': json.dumps({
           'builder_name': build['builder'],
           'changes': [change],
           'properties': properties,
         }),
         'tags': [
             'builder:%s' % build['builder'],
             'buildset:%s' % get_buildset_for(
@@ skipping 145 matching lines @@
     logging.error(
         'Preferred domain name for this app is not set. '
         'See PREFERRED_DOMAIN_NAMES in settings.py: %r', hostname)
     raise ndb.Return([])
 
   return BUILDSET_TAG_FORMAT.format(
       hostname=hostname,
       issue=issue_id,
       patch=patchset_id,
   )