[webrtc-stats] Add field to RTCIceCandidateStats indicating whether or not the candidate has been freed

taylor-b has just created a new issue for 
https://github.com/w3c/webrtc-stats:

== Add field to RTCIceCandidateStats indicating whether or not the 
candidate has been freed ==
RFC5245 section 8.3 talks about a candidate being "freed". I assume 
that for TURN candidates, this means sending a refresh request with a 
lifetime of 0, and for host UDP/TCP candidates, it means closing the 
socket.

It would be useful to have a field (on local candidates) indicating 
whether or not the candidate has been freed. This gives an indication 
of how many sockets and TURN allocations WebRTC is consuming, which 
can be useful information.

Please view or discuss this issue at 
https://github.com/w3c/webrtc-stats/issues/89 using your GitHub 
account