GitLab

Design document:
https://docs.google.com/document/d/1cPF5PruriWNP2Z5gSkq4MBTm0wSZqLyIJkUO9ekibeo

BUG=890413

Change-Id: Ib372a573b1a0f68467f785ce74ef7821c9d48614
Reviewed-on: https://chromium-review.googlesource.com/c/1322350Reviewed-by: Grace Kloba <klobag@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Paul Miller <paulmiller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607816}