It will be used to dump generated audio from TestAudioDeviceModule into user defuned file in peer connection level test framework. Bug: webrtc:10138 Change-Id: I6e3db36aaf1303ab148e8812937c4f9cd1b49315 Reviewed-on: https://webrtc-review.googlesource.com/c/117220 Commit-Queue: Artem Titov <titovartem@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#26267}