GitLab

Fake implementation and unittests are provided, real implementation will
follow.

Bug: b:153649905
Change-Id: I00972b8a5e15b98ff21f6cc70ab4a6c31e6d9848
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302881
Commit-Queue: Leonid Baraz <lbaraz@chromium.org>
Reviewed-by: Zach Trudo <zatrudo@google.com>
Cr-Commit-Position: refs/heads/master@{#797055}