GitLab

This is a proof of concept at this stage.

Written cooperatively with meredithl@ and chrishall@

Bug: 1099069
Change-Id: Ib2c7cf94145bf7080973f7f619cc60dc89124931
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2264176
Commit-Queue: Alice Boxhall <aboxhall@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784271}