Add a flag to filter out high-cost networks.
This allows webrtc to not gather on cellular networks if wifi or
other low cost networks are present.
BUG=

Review-Url: https://codereview.webrtc.org/1987833002
Cr-Commit-Position: refs/heads/master@{#12979}
diff --git a/webrtc/api/java/jni/classreferenceholder.cc b/webrtc/api/java/jni/classreferenceholder.cc
index d332e11..8ed01c5 100644
--- a/webrtc/api/java/jni/classreferenceholder.cc
+++ b/webrtc/api/java/jni/classreferenceholder.cc
@@ -83,6 +83,7 @@
   LoadClass(jni, "org/webrtc/PeerConnection$IceGatheringState");
   LoadClass(jni, "org/webrtc/PeerConnection$IceTransportsType");
   LoadClass(jni, "org/webrtc/PeerConnection$TcpCandidatePolicy");
+  LoadClass(jni, "org/webrtc/PeerConnection$CandidateNetworkPolicy");
   LoadClass(jni, "org/webrtc/PeerConnection$KeyType");
   LoadClass(jni, "org/webrtc/PeerConnection$SignalingState");
   LoadClass(jni, "org/webrtc/RtpReceiver");