Fixing RTCIceCandidatePairStats.nominated for ICE controlling agent.

Was only working when the nonstandard "renomination" extension to ICE
is enabled, which chromium doesn't use.

BUG=chromium:734094

Review-Url: https://codereview.webrtc.org/2957303002
Cr-Commit-Position: refs/heads/master@{#18814}
diff --git a/webrtc/p2p/base/port.cc b/webrtc/p2p/base/port.cc
index e657125..3a3d9ea 100644
--- a/webrtc/p2p/base/port.cc
+++ b/webrtc/p2p/base/port.cc
@@ -1251,7 +1251,14 @@
 void Connection::Ping(int64_t now) {
   last_ping_sent_ = now;
   ConnectionRequest *req = new ConnectionRequest(this);
-  pings_since_last_response_.push_back(SentPing(req->id(), now, nomination_));
+  // If not using renomination, we use "1" to mean "nominated" and "0" to mean
+  // "not nominated". If using renomination, values greater than 1 are used for
+  // re-nominated pairs.
+  int nomination = use_candidate_attr_ ? 1 : 0;
+  if (nomination_ > 0) {
+    nomination = nomination_;
+  }
+  pings_since_last_response_.push_back(SentPing(req->id(), now, nomination));
   packet_loss_estimator_.ExpectResponse(req->id(), now);
   LOG_J(LS_VERBOSE, this) << "Sending STUN ping "
                           << ", id=" << rtc::hex_encode(req->id())
diff --git a/webrtc/pc/rtcstats_integrationtest.cc b/webrtc/pc/rtcstats_integrationtest.cc
index 03fb96c..3337c4e 100644
--- a/webrtc/pc/rtcstats_integrationtest.cc
+++ b/webrtc/pc/rtcstats_integrationtest.cc
@@ -379,6 +379,8 @@
     if (is_selected_pair) {
       verifier.TestMemberIsNonNegative<double>(
           candidate_pair.available_outgoing_bitrate);
+      // A pair should be nominated in order to be selected.
+      EXPECT_TRUE(*candidate_pair.nominated);
     } else {
       verifier.TestMemberIsUndefined(candidate_pair.available_outgoing_bitrate);
     }