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This CL adds
1 - Support unknown features sent from server at the client
2 - UI improvement for video length

Change-Id: I1666e23aae6a3772e2b8478d7a7d37a99e8f104d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2494422Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820414}