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Upon receiving the updated metadata and position information for the
active media session from Media Session Controller, cras_audio_handler
will parse and repack the data for the audio client for further
processing.

Categorize the MediaSessionInfo::SessionState::kDucking to "playing"
instead of "stopped" for audio client.

BUG=b:147365593, b:147365793, b:147367068
TEST=chromeos_unittests

Change-Id: Iea65b931580b5725b807ae268958cf225e121195
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088799Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Commit-Queue: Michael Sun <michaelfsun@google.com>
Cr-Commit-Position: refs/heads/master@{#747438}