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enable_video_with_mixed_audio gn flag has been added to turn on the new
CMA backend.

Created libcast_media_1.0_video, a target that implements this new CMA
backend.

AudioDecoderForMixer now owns an instance of a new interface, AvSync.
AudioDecoderForMixer will notify AvSync of its current status, and
AvSync will call into a new interface, VideoDecoderForMixer.
VideoDecoderForMixer will give AvSync enough control over the video
clock.

BUG=internal 73746352

Change-Id: Id7f991ec9606b6f04dbb68f819ad5bf1c3da9cce
Reviewed-on: https://chromium-review.googlesource.com/947258Reviewed-by: Sergey Volk <servolk@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Commit-Queue: Mina Almasry <almasrymina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541293}