V8 uses buildbucket.py to trigger flake-bisect jobs on command line.
It's more convenient if the build url is shown.

Bug: 711249
Change-Id: I5737c6f3fd72b60517662e8a4808186d6acc71db
Reviewed-on: https://chromium-review.googlesource.com/1226912
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Reviewed-by: smut <smut@google.com>