honghaiz e1a0c942d6 Add network cost as part of the connection ranking.
For now, the network cost is purely based on the network type (cellular has cost 0xFFFF and everything else has cost 0).
Add cost to the candidate signaling and the stun request signaling (which is needed for peer reflexive candidates).
BUG=webrtc:4325

Review URL: https://codereview.webrtc.org/1668073002

Cr-Commit-Position: refs/heads/master@{#11642}
2016-02-16 22:55:01 +00:00
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