Add a continual_gathering_policy in PeerConnection RTCConfiguration

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

Index: talk/app/webrtc/java/src/org/webrtc/PeerConnection.java
diff --git a/talk/app/webrtc/java/src/org/webrtc/PeerConnection.java b/talk/app/webrtc/java/src/org/webrtc/PeerConnection.java
index 8730af96c90035f42e767f73e913f5c849ead55d..706e9587634f8e26997efdedc23610b05504efbf 100644
--- a/talk/app/webrtc/java/src/org/webrtc/PeerConnection.java
+++ b/talk/app/webrtc/java/src/org/webrtc/PeerConnection.java
@@ -146,6 +146,7 @@ public class PeerConnection {
     public boolean audioJitterBufferFastAccelerate;
     public int iceConnectionReceivingTimeout;
     public KeyType keyType;
+    public boolean iceContinueGettingPorts;

[pthatcher1, 2015/09/25 17:37:46]

I think we should call this something like "iceGatherPolicy", with an enum of
something like "GatherOnce" and "GatherContinuously".  That way, we can new
behaviors in the future.  

[pthatcher1, 2015/09/25 17:58:36]

Actually, ORTC already has a GatherPolicy, which is like iceTransportsType here
of all/nohost/relay.  This is orthogonal to that, so perhaps it should be
"ContinuousGatherPolicy" or "NetworkChangeGatherPolicy"

[honghaiz3, 2015/09/25 20:10:20]

Done.

 
     public RTCConfiguration(List<IceServer> iceServers) {
       iceTransportsType = IceTransportsType.ALL;
@@ -157,6 +158,7 @@ public class PeerConnection {
       audioJitterBufferFastAccelerate = false;
       iceConnectionReceivingTimeout = -1;
       keyType = KeyType.ECDSA;
+      iceContinueGettingPorts = false;
     }
   };