RTCIceCandidateStats.transportId added and collected.

webrtc/api/rtcstatscollector.cc

Index: webrtc/api/rtcstatscollector.cc
diff --git a/webrtc/api/rtcstatscollector.cc b/webrtc/api/rtcstatscollector.cc
index cf97057c1b6884595618b3083beeacad5727f93d..29d558a87cf552eaaeb05975dc6faadbf66c0564 100644
--- a/webrtc/api/rtcstatscollector.cc
+++ b/webrtc/api/rtcstatscollector.cc
@@ -265,6 +265,10 @@ const std::string& ProduceIceCandidateStats(
       candidate_stats.reset(new RTCLocalIceCandidateStats(id, timestamp_us));
     else
       candidate_stats.reset(new RTCRemoteIceCandidateStats(id, timestamp_us));
+    if (!candidate.transport_name().empty()) {

[Taylor Brandstetter, 2016/12/22 19:28:31]

Using the transport_name on the candidate isn't reliable (I think it was only
added for a "RemoveCandidates" API, and I'd like to remove it since it's
redundant in most places, and not always kept in sync). I'd just pass the
already-generated transport_id into this method.

[hbos, 2016/12/23 14:25:17]

Done.

+      candidate_stats->transport_id = RTCTransportStatsIDFromTransportChannel(
+          candidate.transport_name(), candidate.component());
+    }
     candidate_stats->ip = candidate.address().ipaddr().ToString();
     candidate_stats->port = static_cast<int32_t>(candidate.address().port());
     candidate_stats->protocol = candidate.protocol();