It is done by making QualityMetricsReporter implements StatsObserverInterface. Bug: webrtc:10138 Change-Id: Ied6c9a7e53bf942d0e48ce107f668b6af8e42735 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/149807 Commit-Queue: Artem Titov <titovartem@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28916}