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CRAS registered a media player with the Chrome OS Bluetooth stack
(BlueZ) following the Bluetooth AVRCP (Audio/Video Remote Control
Profile). The media player is capable of providing media status, track
information, metadata, and etc to the remote Bluetooth device.

This patch (as a part of more changes) adds new functions to support
Playback Status, Player Identity, and Player Position information flow
to the lower level through DBUS.

BUG=b:147365563

Cq-Depend: chromium:2067192
Change-Id: Ib6255a455d97200ba1c7ee2fadb6905f5a6b46d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2069273
Commit-Queue: Jenny Zhang <jennyz@chromium.org>
Auto-Submit: Michael Sun <michaelfsun@google.com>
Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744071}