honghaiz a54a080112 Add ufrag to the ICE candidate signaling.
On the receiving side, if a candidate arrives with an old ufrag, it will be dropped. If it contains a new frag that has never seen before, it will hold the ufrag and create connections, although those connections are not pingable until the ICE credentials are received.
This could avoid a bunch of ICE generation issues.

BUG=webrtc:5138,webrt:5292

Review URL: https://codereview.webrtc.org/1498993002

Cr-Commit-Position: refs/heads/master@{#11060}
2015-12-17 02:37:27 +00:00
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Name: WebRTC
URL: http://www.webrtc.org
Version: 90
License: BSD
License File: LICENSE

Description:
WebRTC provides real time voice and video processing
functionality to enable the implementation of 
PeerConnection/MediaStream.

Third party code used in this project is described 
in the file LICENSE_THIRD_PARTY.