[webrtc-stats] new commits pushed by henbos

The following commits were just pushed by henbos to https://github.com/w3c/webrtc-stats:

* Add RTCMediaSourceStats dictionaries for pre-encoding metrics (#435)

* RTCMediaSourceStats

* RTCAudioSourceStats and RTCVideoSourceStats

* nits

* Addressed comment
  by henbos
https://github.com/w3c/webrtc-stats/commit/ba9988d5ddb2450d62b74636b407cc890cb737af

Received on Monday, 20 May 2019 13:33:11 UTC