GitLab

Also, add a comment in the proto.
See http://b/123719599 for details.

R=drubery

Bug: 907280,927831
Change-Id: Idc690f25bfc3b909eead54c0184184bcf0df8a32
Reviewed-on: https://chromium-review.googlesource.com/c/1450415Reviewed-by: Daniel Rubery <drubery@chromium.org>
Commit-Queue: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628425}