Let Blink try jobs use a Blink-specific LKGR

scripts/master/try_job_base.py

 # Copyright (c) 2012 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.
 
 import re
 import traceback
 import sys
 
 from buildbot.process.properties import Properties
 from buildbot.schedulers.trysched import TryBase
@@ skipping 243 matching lines @@
         repository=parsed_job['repository'] or '',
         changeids=changeids)
 
     d.addCallback(self.create_buildset, parsed_job)
     d.addErrback(log.err, "Failed to queue a try job!")
     return d
 
   def get_lkgr(self, options):
     """Grabs last known good revision number if necessary."""
     options['rietveld'] = (self.code_review_sites or {}).get(options['project'])
-    last_good_url = (self.last_good_urls or {}).get(options['project'])
+
+    # TODO: crbug.com/233418 - Only use the blink url for jobs with the blink
+    # project set. This will require us to always set the project in blink
+    # configs.
+    project = options['project']
+    if project == 'chrome' and all('_layout_' in bot for bot in options['bot']):
+      project = 'blink'
+    last_good_url = (self.last_good_urls or {}).get(project)
+
     if options['revision'] or not last_good_url:
       return defer.succeed(0)
 
     def Success(result):
       try:
         new_value = int(result.strip())
       except (TypeError, ValueError):
         new_value = None
       if new_value and (not self._last_lkgr or new_value > self._last_lkgr):
         self._last_lkgr = new_value
       options['revision'] = self._last_lkgr or 'HEAD'
 
     def Failure(result):
       options['revision'] = self._last_lkgr or 'HEAD'
 
     connection = client.getPage(last_good_url, agent='buildbot')
     connection.addCallbacks(Success, Failure)
     return connection