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
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Name: WebRTC
URL: http://www.webrtc.org
Version: 90
License: BSD
License File: LICENSE

Description:
WebRTC provides real time voice and video processing
functionality to enable the implementation of 
PeerConnection/MediaStream.

Third party code used in this project is described 
in the file LICENSE_THIRD_PARTY.