Taylor Brandstetter a27cfbffdf Fix echo return loss stats and add to RTCAudioSourceStats.
This solves two problems:
* Echo return loss stats weren't being gathered in Chrome, because they
  need to be taken from the audio processor attached to the track
  rather than the audio send stream.
* The standardized location is in RTCAudioSourceStats, not
  RTCMediaStreamTrackStats. For now, will populate the stats in both
  locations.

Bug: webrtc:12770
Change-Id: I47eaf7f2b50b914a1be84156aa831e27497d07e3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/223182
Commit-Queue: Taylor Brandstetter <deadbeef@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34344}
2021-06-21 21:18:02 +00:00
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