Add brillo to list of allowable bug prefixes

BUG=brillo:7
TEST=linter fine with my autotest change

Change-Id: I15acf1d053ac319bd2273202512545d2e7b70375
Reviewed-on: https://chromium-review.googlesource.com/243316
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
diff --git a/pre-upload.py b/pre-upload.py
index 67b107a..5279da5 100755
--- a/pre-upload.py
+++ b/pre-upload.py
@@ -396,9 +396,10 @@
            'the chromium tracker in your BUG= line now.')
     return HookFailure(msg)
 
-  BUG_RE = r'\nBUG=([Nn]one|(chrome-os-partner|chromium):\d+)'
+  BUG_RE = r'\nBUG=([Nn]one|(chrome-os-partner|chromium|brillo):\d+)'
   if not re.search(BUG_RE, _get_commit_desc(commit)):
     msg = ('Changelist description needs BUG field (after first line):\n'
+           'BUG=brillo:9999 (for Brillo tracker)\n'
            'BUG=chromium:9999 (for public tracker)\n'
            'BUG=chrome-os-partner:9999 (for partner tracker)\n'
            'BUG=None')