CRAS cras_test_client: Playback stream from stdin
CRAS cras_test_client: Playback stream from stdin

--plaback_stdin flag allows cras_test_client to play
the raw audio read from stdin. This is for testing multiple
channel audio on various channel layout.

BUG=chromium:214597
TEST=sox -n -t raw -b 16 -c 6 -r 48000 - synth 10 sine 0 sine 0 sine 0
sine 1000 sine 1000 sine 0 | cras_test_client --playback_stdin
--num_channels=6

Change-Id: I30532186272f2ec0637163e2412431c7047d1bdf
Reviewed-on: https://chromium-review.googlesource.com/173851
Reviewed-by: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>
Commit-Queue: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>
Tested-by: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>

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