Otherwise bandwidth observer might miss rtt calculated from previous report block Bug: webrtc:8805 Change-Id: If3c4f4ee2e923d440ff352e8b770442f1a11fa34 Reviewed-on: https://webrtc-review.googlesource.com/44480 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21800}