This will be the one way of toggling AEC. The EchoControlMobile and
EchoCancellation interfaces will be removed.
The settings introduced here are not used yet, to allow for smooth
downstream fixes.
Bug: webrtc:9535
Change-Id: I3b1a524a0ab7daf63419d7e5ed47417b9282dbf6
Reviewed-on: https://webrtc-review.googlesource.com/90864
Reviewed-by: Per Åhgren <peah@webrtc.org>
Commit-Queue: Sam Zackrisson <saza@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24129}