GitLab

Add a custom view to use when showing a media
notification. At the moment this will just show
and hide the control buttons on hover.

BUG=897836

Change-Id: Ie6335b3fbff55e1f9d588cfbe3e95678fb0b8e1a
Reviewed-on: https://chromium-review.googlesource.com/c/1297246
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603684}