GitLab

This prevents the slider views from awkwardly overlapping with the
shelf.

Bug: 1136564
Change-Id: I83551c6c5c2efb244d245a1055238ba6841d96c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2499641
Commit-Queue: Angus McLean <angusmclean@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823297}