Let Blink try jobs use a Blink-specific LKGR

scripts/master/try_job_base.py

Index: scripts/master/try_job_base.py
diff --git a/scripts/master/try_job_base.py b/scripts/master/try_job_base.py
index 38af40d988f47003d0892163eb72672653e269e9..8cccd3b30f06f459b13d9167e3bf2194ad384ff4 100644
--- a/scripts/master/try_job_base.py
+++ b/scripts/master/try_job_base.py
@@ -261,7 +261,15 @@ class TryJobBase(TryBase):
   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)