GitLab

Add a rough sketch of media controls view to the system tray. Contains
the layout for the chip, artwork, title and artist label.

UI screenshot (dummy content):
https://screenshot.googleplex.com/jGkyTezPpoS

Change-Id: I5c96ee6ca73da086063e1fe3c2842b969f5e24ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314197Reviewed-by: Tim Song <tengs@chromium.org>
Commit-Queue: Andre Le <leandre@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791927}