GitLab

And add some delay before stating opacity animation.

BUG=1020735

Change-Id: I5fabd3923c55ecf969727b2887e32dd938873b41
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895080Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712347}