Collected for current pairs, undefined for other pairs. This is the same as the old stats' VideoBwe.googAvailable[Send/Receive]Bandwidth. NOTE: The value this is based on for incoming bitrate is not set. This CL wires it up but has a TODO that the incoming bitrate needs to be collected properly. (Same problem for both old and new stats.) Spec: https://w3c.github.io/webrtc-stats/#dom-rtcicecandidatepairstats-availableoutgoingbitrate Discussion: https://github.com/w3c/webrtc-stats/issues/112#issuecomment-277167781 BUG=webrtc:7062 Review-Url: https://codereview.webrtc.org/2675923002 Cr-Commit-Position: refs/heads/master@{#16472}