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This change implements the RTCIceTransport.gather() method and
associated methods/events: getLocalCandidates(), gatheringState,
ongatheringstatechange, and onicecandidate.

The state property is also partially implemented so that the
RTCIceTransport can be stopped and garbage collected.

Bug: 864871
Change-Id: I7056764789d92dc93038a7a2279a15c850b4d299
Reviewed-on: https://chromium-review.googlesource.com/1153845
Commit-Queue: Steve Anton <steveanton@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Harald Alvestrand <hta@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585634}