saza 746749237a Add received audio/video call duration metrics based on packets.
Tracks time between first and last audio and packets to successfully pass through Call object's DeliverRtp method, timed with packet timestamps.

BUG=webrtc:7882

Review-Url: https://codereview.webrtc.org/2957073002
Cr-Commit-Position: refs/heads/master@{#18881}
2017-07-04 07:19:22 +00:00
..
2016-12-16 10:12:31 +00:00