GitLab

Test: Played 5.1 opus encoded audio file through chromecast by pointing the chromecast to a local server and audio comes out of the AVR at the expected channel.
Bug: b/133189747
Change-Id: Ia0e77ea9f6f8b3f9cd35803dffa5888fec0335d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1627759Reviewed-by: Sergey Volk <servolk@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: Sergey Volk <servolk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664079}