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Currently, the initial media control state for play/pause is incorrect.
It shows the opposite control than intended.

Tests forthcoming in a future patch once we have test infrastructure
set up.

BUG: 836389
Change-Id: Ie7be9bfb384f62ac925d6cb1c1ee30cc6baf2cfc
Reviewed-on: https://chromium-review.googlesource.com/1060244Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: apacible <apacible@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558894}