GitLab

Add a collapsed mode where the notification will
show fewer action buttons and also place the
buttons to the right of the title/artist
information.

BUG=893296

Change-Id: I5a05f074ddda0d000a26db76b26ccc97fd732cd7
Reviewed-on: https://chromium-review.googlesource.com/c/1327613
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@{#612823}