Re: [webrtc-pc] RTCTrackEvent's type parameter

The `type` and `eventInitDict` parameters are [required for Events](https://dom.spec.whatwg.org/#constructing-events). Best practice is to include constructors for shims to use.

We *[fire a track event](http://w3c.github.io/webrtc-pc/#fire-track-event) [named](https://dom.spec.whatwg.org/#firing-events) "track"* [here](http://w3c.github.io/webrtc-pc/#set-description), but you can set it to anything you want.

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Received on Thursday, 7 December 2017 00:12:42 UTC