hbos 160e4a78e3 RTCMediaStreamTrackStats.kind added and collected.
Implements recent spec change:
https://github.com/w3c/webrtc-stats/pull/127

BUG=chromium:659137, chromium:627816

Review-Url: https://codereview.webrtc.org/2623513006
Cr-Commit-Position: refs/heads/master@{#16111}
2017-01-17 10:53:23 +00:00
..
2016-05-15 02:44:18 +00:00
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