The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ee45ea26e65f48972bfe538d40c8572565e82ecf

commit ee45ea26e65f48972bfe538d40c8572565e82ecf
Author: Tommy Steimel <steimel@chromium.org>
Date: Wed Apr 11 16:24:00 2018

Show overlay cast button on modern media controls

This CL adds some CSS from the legacy controls into the modern media
controls so that the overlay cast button is able to show up.

Bug:  831363 
Change-Id: I234079b2b789aad4bdc8c27fb0c124810cd18c17
Reviewed-on: https://chromium-review.googlesource.com/1006070
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549905}
[modify] https://crrev.com/ee45ea26e65f48972bfe538d40c8572565e82ecf/third_party/blink/renderer/modules/media_controls/resources/modernMediaControls.css