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The live caption feature will have a promo underneath of the global
media controls in order to inform users of this feature and help them
find where to enable it.

Bug: 1055150
Change-Id: I00fb0a4a4dfaeba507aac7b3a3d00a93577a731e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2406537
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808156}