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Add a new function in cras_audio_client to support propagate media
track duration/length to Chrome OS via DBUS CRAS Control Interface. As
Bluetooth Stack (BlueZ) and MPRIS defined media duration to be a part of
metadata, SetPlayerDuration function will wrap the duration informatio
into the metadata format and forward it to DBUS.

BUG=b:147365563
TEST=chromeos_unittests

Change-Id: I3a6b91247a58f8898fa05f0dfe89195cdbfe7c8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2081262
Commit-Queue: Michael Sun <michaelfsun@google.com>
Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746994}