Increase Dart's github polling interval, especially for client.dart.packages.

masters/master.client.dart.packages/master.cfg

 # -*- python -*-
 # ex: set syntax=python:
 
 # 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.
 
 
 from buildbot.scheduler import Dependent
 from buildbot.scheduler import Scheduler
@@ skipping 103 matching lines @@
 c['builders'] = utils.get_builders_from_variants(variants, slaves, [])
 
 ####### CHANGESOURCES
 
 # General trigger used to trigger all bots when we have a new sdk.
 c['change_source'] = [utils.get_github_poller('dart-lang', 'package-bots')]
 
 poller = pub_poller.PubPoller(PUBLISHED_PACKAGE_NAMES, project='pub_packages')
 c['change_source'].append(poller)
 
+interval = 300
 for package in PACKAGES:
+  interval += 7;
+  if interval > 400: interval -= 100
   if package.isGithubPackage() and package.run_tests:
     c['change_source'].append(
-        utils.get_github_poller(package.github_project, package.github_repo))
+        utils.get_github_poller(package.github_project, package.github_repo,
+                                interval=interval))
     for branch in package.extra_branches:
       c['change_source'].append(
         utils.get_github_poller(package.github_project, package.github_repo,
-                                branch))
+                                branch, interval=interval))
 
 ####### BUILDSLAVES
 
 c['slaves'] = utils.get_slaves(c['builders'])
 
 # Make sure everything works together.
 master_utils.VerifySetup(c, slaves)
 
 # Prioritize the builders depending on channel.
 c['prioritizeBuilders'] = utils.prioritize_builders
@@ skipping 28 matching lines @@
     },
   ]
 
   for notifier in utils.get_mail_notifier_statuses(mail_notifiers):
     c['status'].append(notifier)
 
 # Keep last build logs, the default is too low.
 c['buildHorizon'] = 1000
 c['logHorizon'] = 500
 # Must be at least 2x the number of slaves.
-c['eventHorizon'] = 200
+c['eventHorizon'] = 600
 
 # Template generation is using 40 entries, so give it a little extra.
 c['buildCacheSize'] = 42
 
 c['properties'] = {'mastername': master_utils.GetMastername()}
 
 ####### PROJECT IDENTITY
 
 # the 'projectName' string will be used to describe the project that this
 # buildbot is working on. For example, it is used as the title of the
 # waterfall HTML page. The 'projectURL' string will be used to provide a link
 # from buildbot HTML pages to your project's home page.
 
 c['projectName'] = ActiveMaster.project_name
 c['projectURL'] = config.Master.project_url
 
 # the 'buildbotURL' string should point to the location where the buildbot's
 # internal web server (usually the html.Waterfall page) is visible. This
 # typically uses the port number set in the Waterfall 'status' entry, but
 # with an externally-visible host name which the buildbot cannot figure out
 # without some help.
 
 c['buildbotURL'] = ActiveMaster.buildbot_url