Reland of rename existing Blink try bots to include OS version.

masters/master.tryserver.blink/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.
 
 # READ THIS:
 # See http://dev.chromium.org/developers/testing/chromium-build-infrastructure
 
 import os
@@ skipping 28 matching lines @@
   props = {'path_config': 'kitchen'}
   props.update(kwargs.pop('properties', {}))
   return remote_run_factory.RemoteRunFactory(
     active_master=ActiveMaster,
     repository='https://chromium.googlesource.com/chromium/tools/build.git',
     recipe=recipe,
     factory_properties=props,
     **kwargs)
 
 c['builders'] = []
-for platform in ['linux', 'mac', 'win']:
+for platform in ['linux_precise', 'mac10.9', 'win7']:
   for target in ['_dbg', '_compile_dbg', '_compile_rel', '_rel']:
     c['builders'].append({
       'name': '%s_blink%s' % (platform, target),
       'factory': m_remote_run('chromium_trybot', timeout=3600),
       'slavebuilddir': '%s_layout' % platform
     })
 
 for platform in ['mac10.10', 'mac10.11', 'win10', 'linux_trusty']:
   c['builders'].append({
     'name': '%s_blink_rel' % platform,
@@ skipping 57 matching lines @@
 c['logHorizon'] = 3000
 # Must be at least 2x the number of slaves.
 c['eventHorizon'] = 200
 
 # Adjust the buildCaches to be 3x the number of slaves per builder.
 c['autoBuildCacheRatio'] = 3
 
 c['projectURL'] = 'http://dev.chromium.org/developers/testing/try-server-usage'
 
 # vi: set ts=4 sts=2 sw=2 et: