Make timestamps on the charts for metrics reported from
DefaultVideoQualityAnalyzer more precise.
Bug: webrtc:11959
Change-Id: I805fdac0d499b7326d6bc2240154c1c31ca81a62
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/184602
Reviewed-by: Andrey Logvin <landrey@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32149}