Add bling-autoroll-builder to known robot accounts

Bug: 1026669
Change-Id: I36cc5655bb87e4c73a96ad88307ae5047729ca77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1949665Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: smut <smut@google.com>
Cr-Commit-Position: refs/heads/master@{#721311}

PRESUBMIT.py

@@ -1374,7 +1374,8 @@ _KNOWN_ROBOTS = set(
   ) | set('%s@appspot.gserviceaccount.com' % s for s in ('findit-for-me',)
   ) | set('%s@developer.gserviceaccount.com' % s for s in ('3su6n15k.default',)
   ) | set('%s@chops-service-accounts.iam.gserviceaccount.com' % s
-          for s in ('v8-ci-autoroll-builder', 'wpt-autoroller',)
+          for s in ('bling-autoroll-builder', 'v8-ci-autoroll-builder',
+                    'wpt-autoroller',)
   ) | set('%s@skia-public.iam.gserviceaccount.com' % s
           for s in ('chromium-autoroll',)
   ) | set('%s@skia-corp.google.com.iam.gserviceaccount.com' % s