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Unlike most keyboards, which have a single Play/Pause toggle key,
Bluetooth devices with AVRCP (Audio/Video Remote Control Profile)
generate separate Play and Pause key events based on the media status.
This patch adds handling for the Play media key.

BUG=b/147364135

Change-Id: Ie3cbc4c02ceab8e317f79d089eb8b163aa3ed658
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062941Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Michael Sun <michaelfsun@google.com>
Cr-Commit-Position: refs/heads/master@{#742767}