GitLab

Since Goma Canary builders are scattered to cr-buildbucket.cfg and
is difficult to see, let me gather all the builders to one place.

Bug: 874754
Change-Id: Ie8ca261cc28f734c4175d6fc07082429e0c026da
Reviewed-on: https://chromium-review.googlesource.com/1188045Reviewed-by: Ryan Tseng <hinoka@chromium.org>
Commit-Queue: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585729}