Spec:Expose RTCDataChannel and RTCDataChannelEvent (with a constructor for RTCDataChannelEvent)
Link to "intent to implement" blink-dev discussion:
This does not affect which events are fired, it means only that the RTCDataChannelEvent interface is exposed and can be used as a constructor.
Is this feature supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes
Interoperability and Compatibility Risk
Firefox has this (but they need to update their idl to sync with the most recent spec)
Entry on the feature dashboard
No entry was added for RTCDataChannel because it was merely exposed and nothing else about it will change. Because it has no constructor, there isn't much one can do with the RTCDataChannel interface object.