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This CL adds track kind marker styling to the Media Controls CSS that
was never copied over from the legacy controls CSS.

Bug: 933000
Change-Id: Ie4fc1c5a7706664a9afff841c5ccc47399dbb4b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829278Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702490}