Allow referencing buganizer issues with ANGLE CLs.

Based on
http://google3/experimental/users/jsharkey/gitwatcher2/configs.py?l=42&rcl=299145346,
chromium CLs with b: should be found by buganizer.

BUG=b:151095080

Change-Id: Iaf4def18dbe52fe87c9e4655f114fac225d429ce
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2095595
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index f71cd0c..bc286b8 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -43,7 +43,7 @@
     if len(bugs) == 1 and bugs[0] == 'None':
         return []
 
-    projects = ['angleproject', 'chromium', 'dawn', 'fuchsia', 'skia', 'swiftshader']
+    projects = ['angleproject', 'chromium', 'dawn', 'fuchsia', 'skia', 'swiftshader', 'b']
     bug_regex = re.compile(r"([a-z]+):(\d+)")
     errors = []
     extra_help = None