Updated histograms: "WebRTC.Video.ReceivedPacketsLostInPercent" (two RTCP RR previously needed) "WebRTC.Video.ReceivedFecPacketsInPercent" (one received packet previously needed) "WebRTC.Video.RecoveredMediaPacketsInPercentOfFec" (one received FEC packet previously needed) Prevents logging stats if call was shortly in use. BUG=b/32659204 Review-Url: https://codereview.webrtc.org/2536653002 Cr-Commit-Position: refs/heads/master@{#15315}