Add a new buildbot-tool generator for master configs

scripts/tools/buildbot_tool_templates/master.cfg

 # Copyright 2014 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.
 
+# This file is used by scripts/tools/buildbot-tool to generate master configs.
+
 # These modules come from scripts/master, which must be in the PYTHONPATH.
+from master import gitiles_poller
 from master import master_utils
 from master import slaves_list
 from master.factory import annotator_factory
 from buildbot.schedulers.basic import SingleBranchScheduler
 from buildbot.status.mail import MailNotifier
 
 import config
 import master_site_config
-ActiveMaster = master_site_config.Mojo
+ActiveMaster = master_site_config.%(master_classname)s
 
 m_annotator = annotator_factory.AnnotatorFactory()
 
 c = BuildmasterConfig = {}
 c['change_source'] = []
 c['schedulers'] = []
 c['builders'] = []
 c['status'] = []
 
-builders = ['Mojo Linux',
-            'Mojo Linux (dbg)',
-            'Mojo Linux ASan',
-            'Mojo Android Builder',
-            'Mojo Android Builder (dbg)',
-            'Mojo Android Builder Tests (dbg)',
-            'Mojo ChromeOS Builder',
-            'Mojo ChromeOS Builder (dbg)',
-            'Mojo Linux Perf']
-
-for builder_name in builders:
-  c['builders'].append({
-    'name': builder_name,
-    'factory': m_annotator.BaseFactory('mojo'),
-    'slavebuilddir': 'mojo',
-  })
+%(builders_block)s
 
 config.DatabaseSetup(c, require_dbconfig=ActiveMaster.is_production_host)
 
-import master_source_cfg
-
-master_source_cfg.Update(config, ActiveMaster, c)
+c['change_source'].append(gitiles_poller.GitilesPoller(
+    '%(git_repo_url)s'))
 
 c['schedulers'].extend([
     SingleBranchScheduler(name='source',
                           branch='master',
                           treeStableTimer=60,
-                          builderNames=builders)
+                          builderNames=[b['name'] for b in c['builders']])
     ])
 
 c['logCompressionLimit'] = False
 c['projectName'] = ActiveMaster.project_name
 c['projectURL'] = config.Master.project_url
 # Must come before AutoSetupMaster().
 c['buildbotURL'] = ActiveMaster.buildbot_url
 
 # Associate the slaves to the manual builders. The configuration is in
 # slaves.cfg.
-slaves = slaves_list.SlavesList('slaves.cfg', 'Mojo')
+slaves = slaves_list.SlavesList('slaves.cfg', '%(master_classname)s')
 for builder in c['builders']:
   builder['slavenames'] = slaves.GetSlavesName(builder=builder['name'])
 
 # The 'slaves' list defines the set of allowable buildslaves. List all the
 # slaves registered to a builder. Remove dupes.
 c['slaves'] = master_utils.AutoSetupSlaves(
     c['builders'],
     config.Master.GetBotPassword(),
     missing_recipients=['buildbot@chromium-build-health.appspotmail.com'])
 master_utils.VerifySetup(c, slaves)
 
 # Adds common status and tools to this master.
 master_utils.AutoSetupMaster(c, ActiveMaster,
     public_html='../master.chromium/public_html',
     templates=['../master.chromium/templates'],
     tagComparator=getattr(c['change_source'][0], 'comparator', None),
     enable_http_status_push=ActiveMaster.is_production_host)
 
 c['status'].append(MailNotifier(fromaddr=ActiveMaster.from_address,
                                 mode='problem',
                                 relayhost=config.Master.smtp))
 
 # Do it at the end to override values set by AutoSetupMaster, the default is
 # too low. Must keep at least a few days worth of builds.
 c['buildHorizon'] = 3000
 c['logHorizon'] = 3000
 # Must be at least 2x the number of slaves.
 c['eventHorizon'] = 200