GitLab

IMO he's done enough work on the tabstrip during the Refresh cycle to be able to
review changes here.

TBR=sky

Bug: none
Change-Id: I1522042e5244e225a7ce2c86d87397729a2086fe
Reviewed-on: https://chromium-review.googlesource.com/1147661
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577791}