GitLab

-CmaAudioOutputStreamInternal will be a pure push mode output stream.
And CmaAudioOutputStream will keep the backend state control and push
timer logic.

Bug: internal b/152920790

Test: Cast from Youtube to Android TV device.

Change-Id: Iadbb82a8017b8779a6c96a8473b1179469966242
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2242650
Commit-Queue: Ziyang Cheng <ziyangch@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780110}