hbos 7b0c6fa274 RTCStatsCollector: Get track IDs from senders/receivers instead of
streams.

When addTrack/removeTrack is used instead of addStream/removeStream
we an end up with tracks that are not contained within any local or
remote stream.

If all track IDs are not mapped when we produce RTCRTPStreamStats
we'll hit a DCHECK.

BUG=chromium:741638

Review-Url: https://codereview.webrtc.org/2978793002
Cr-Commit-Position: refs/heads/master@{#18991}
2017-07-12 23:22:34 +00:00
..
2017-07-11 13:20:45 +00:00
2016-04-26 12:28:18 +00:00