UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:49.0) Gecko/20100101 Firefox/49.0

Steps to reproduce the problem:
1. Open attached file or https://jsfiddle.net/jib1/m829gan2/ in two tabs in Chrome.
2. Click "Call!" button in Tab A and share camera + mic

What is the expected behavior?
Stable audio+video shown with the following output in Tab A:

negotiationneeded
checking
connected
completed

... and in Tab B:

checking
connected

What went wrong?
Blinking audio+video shown with the following output in Tab A:

negotiationneeded
checking
connected
completed
negotiationneeded
negotiationneeded
negotiationneeded
negotiationneeded
negotiationneeded
negotiationneeded
negotiationneeded
negotiationneeded
negotiationneeded

... and in Tab B:

negotiationneeded
checking
connected
negotiationneeded
negotiationneeded
negotiationneeded
negotiationneeded
negotiationneeded
negotiationneeded
negotiationneeded
negotiationneeded
negotiationneeded

Did this work before? No 

Does this work in other browsers? N/A

Chrome version: 54.0.2840.98 (Official Build) (64-bit)  Channel: stable
OS Version: OS X 10.11
Flash Version: Shockwave Flash 23.0 r0

This is a rudimentary audiovisual two-way WebRTC demo, with pc.onnegotiationneeded primed to send a new offer.

During negotiation, Chrome fails to clear negotiationneeded on the answerer side, after the expected audio and video have been added, and keeps firing negotiationneeded back and forth forever.

See http://w3c.github.io/webrtc-pc/#clearing-negotiation-needed

Compare to Firefox which produces the expected result.
 

Deleted: negotiationneeded.html 1.4 KB

negotiationneeded.html 1.4 KB View Download