Relanding: Add the url attribute to the IceCandidate (Java Wrapper)

webrtc/sdk/android/api/org/webrtc/IceCandidate.java

 /*
  *  Copyright 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 package org.webrtc;
 
 /**
  * Representation of a single ICE Candidate, mirroring
  * {@code IceCandidateInterface} in the C++ API.
  */
 public class IceCandidate {
   public final String sdpMid;
   public final int sdpMLineIndex;
   public final String sdp;
+  public final String serverUrl;
 
   public IceCandidate(String sdpMid, int sdpMLineIndex, String sdp) {
     this.sdpMid = sdpMid;
     this.sdpMLineIndex = sdpMLineIndex;
     this.sdp = sdp;
+    this.serverUrl = "";
+  }
+
+  // Only be called internally from JNI.
+  private IceCandidate(String sdpMid, int sdpMLineIndex, String sdp, String serverUrl) {
+    this.sdpMid = sdpMid;
+    this.sdpMLineIndex = sdpMLineIndex;
+    this.sdp = sdp;
+    this.serverUrl = serverUrl;
   }
 
   public String toString() {
-    return sdpMid + ":" + sdpMLineIndex + ":" + sdp;
+    return sdpMid + ":" + sdpMLineIndex + ":" + sdp + ":" + serverUrl;
   }
 }