GitLab

For context see
https://github.com/w3c/csswg-drafts/issues/2140

Intent:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/oBKMVCOX1sY/BLsXXiukAgAJ

Bug: 804187
Change-Id: I8a430943a5d873a55055654bcef2365d40dd71e3
Reviewed-on: https://chromium-review.googlesource.com/892838
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: nainar <nainar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533102}