Ping backup connection at a slower rate

talk/app/webrtc/java/src/org/webrtc/PeerConnection.java

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 133 matching lines @@
   /** Java version of PeerConnectionInterface.RTCConfiguration */
   public static class RTCConfiguration {
     public IceTransportsType iceTransportsType;
     public List<IceServer> iceServers;
     public BundlePolicy bundlePolicy;
     public RtcpMuxPolicy rtcpMuxPolicy;
     public TcpCandidatePolicy tcpCandidatePolicy;
     public int audioJitterBufferMaxPackets;
     public boolean audioJitterBufferFastAccelerate;
     public int iceConnectionReceivingTimeout;
+    public int iceBackupConnectionPingInterval;
     public KeyType keyType;
     public ContinualGatheringPolicy continualGatheringPolicy;
 
     public RTCConfiguration(List<IceServer> iceServers) {
       iceTransportsType = IceTransportsType.ALL;
       bundlePolicy = BundlePolicy.BALANCED;
       rtcpMuxPolicy = RtcpMuxPolicy.NEGOTIATE;
       tcpCandidatePolicy = TcpCandidatePolicy.ENABLED;
       this.iceServers = iceServers;
       audioJitterBufferMaxPackets = 50;
       audioJitterBufferFastAccelerate = false;
       iceConnectionReceivingTimeout = -1;
+      iceBackupConnectionPingInterval = -1;
       keyType = KeyType.ECDSA;
       continualGatheringPolicy = ContinualGatheringPolicy.GATHER_ONCE;
     }
   };
 
   private final List<MediaStream> localStreams;
   private final long nativePeerConnection;
   private final long nativeObserver;
   private List<RtpSender> senders;
   private List<RtpReceiver> receivers;
@@ skipping 109 matching lines @@
 
   private native void nativeRemoveLocalStream(long nativeStream);
 
   private native boolean nativeGetStats(
       StatsObserver observer, long nativeTrack);
 
   private native List<RtpSender> nativeGetSenders();
 
   private native List<RtpReceiver> nativeGetReceivers();
 }