Minyue 2a8a78c905 Add AEC filter divergence metric to StatsCollector.
A new metric that tells how often the AEC linear filter diverges has been recently introduced, see
https://codereview.webrtc.org/1739993003/

This metric can reflect echo failure and ducking.

In this CL, we add a field in StatsCollector to receive this metric.

BUG=
R=tommi@webrtc.org

Review URL: https://codereview.webrtc.org/1866983002 .

Cr-Commit-Position: refs/heads/master@{#12282}
2016-04-07 14:47:53 +00:00
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