The buildbucket API is not always reliable and responds within 30 seconds.
Rather than spuriously failing, try again. This should improve the
reliability of the base branch update bot.
Change-Id: Iade2d78372743b8d843c0dead591c28f8ee8f3ae
Reviewed-on: https://dart-review.googlesource.com/c/88445
Reviewed-by: William Hesse <whesse@google.com>
The find_base_commit program locates the newest commit with a full set of
test results. This is a good base for local testing when comparing with the
results from the official bots, as all the needed results are there.
Change-Id: Ie06020ca98317b82f46589ad6dede37361acf744
Reviewed-on: https://dart-review.googlesource.com/c/81040
Reviewed-by: Alexander Thomas <athom@google.com>