Tests RTCPeerConnection onnegotiationneeded.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS Got a stream.
PASS onNegotiationNeeded was called when a track was added.
PASS onNegotiationNeeded2 was called when a track was removed.
PASS onNegotiationNeeded3 was called when a track was added.
PASS successfullyParsed is true

TEST COMPLETE