GitLab

* Add CastAudioDeviceFactory to use simple AudioOutputDevice; disables
mixer
* Use MakeAudioOutputStream instead of MakeAudioOutputStreamProxy;
prevents AudioOutputStream from closing
* Update CastAudioOutputStream Start/Stop/Flush logic.

Bug: b/124402185
Change-Id: Iabf4c06e7b2af40dd714d589713ac00880c25e89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1625959Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Alex Leung <alexleung@google.com>
Cr-Commit-Position: refs/heads/master@{#663984}