This allows running Peerconnection level tests with a custom NetEqFactory. Bug: webrtc:11005 Change-Id: If3063cf61a6274a137e4ab74f9ec2665425f21ae Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/161307 Reviewed-by: Artem Titov <titovartem@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Commit-Queue: Ivo Creusen <ivoc@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30028}