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

masters/master.tryserver.blink/slaves.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.
 
 # See master.experimental/slaves.cfg for documentation.
 
 slaves = []
 
 for slave in range(501, 506):
   slaves.append({
     'master': 'BlinkTryServer',
     'os': 'linux',
     'version': 'precise',
     'bits': '64',
     'builder': [
-      'linux_blink_compile_dbg',
-      'linux_blink_compile_rel',
-      'linux_blink_dbg',
-      'linux_blink_rel',
+      'linux_precise_blink_compile_dbg',
+      'linux_precise_blink_compile_rel',
+      'linux_precise_blink_dbg',
+      'linux_precise_blink_rel',
     ],
     'hostname': 'slave%d-c4' % slave,
   })
 
 for slave in [601, 603, 605, 607, 609]:
   slaves.append({
     'master': 'BlinkTryServer',
     'os': 'mac',
     'version': '10.9',
     'bits': '64',
     'builder': [
-      'mac_blink_compile_dbg',
-      'mac_blink_compile_rel',
-      'mac_blink_dbg',
-      'mac_blink_rel',
+      'mac10.9_blink_compile_dbg',
+      'mac10.9_blink_compile_rel',
+      'mac10.9_blink_dbg',
+      'mac10.9_blink_rel',
     ],
     'hostname': 'vm%d-m4' % slave,
   })
 
 for slave in [106, 114, 425, 496]:
   slaves.append({
     'master': 'BlinkTryServer',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
     'builder': [
-      'win_blink_compile_dbg',
-      'win_blink_compile_rel',
-      'win_blink_dbg',
-      'win_blink_rel',
+      'win7_blink_compile_dbg',
+      'win7_blink_compile_rel',
+      'win7_blink_dbg',
+      'win7_blink_rel',
     ],
     'hostname': 'vm%d-m4' % slave,
   })
 
 slaves.append({
   'master': 'BlinkTryServer',
   'os': 'mac',
   'version': '10.10',
   'bits': '64',
   'builder': ['mac10.10_blink_rel'],
@@ skipping 20 matching lines @@
   })
 
 slaves.append({
   'master': 'BlinkTryServer',
   'os': 'linux',
   'version': 'trusty',
   'bits': '64',
   'builder': ['linux_trusty_blink_rel'],
   'hostname': 'slave137-c4',
 })