Adding API for "presume writable when fully relayed" ICE option.

webrtc/api/android/java/src/org/webrtc/PeerConnection.java

Index: webrtc/api/android/java/src/org/webrtc/PeerConnection.java
diff --git a/webrtc/api/android/java/src/org/webrtc/PeerConnection.java b/webrtc/api/android/java/src/org/webrtc/PeerConnection.java
index ad8362d4859057e3e4f798218ea7c250296cb148..04fd563e11279ef88f0c1cdc65ddf315100c11d4 100644
--- a/webrtc/api/android/java/src/org/webrtc/PeerConnection.java
+++ b/webrtc/api/android/java/src/org/webrtc/PeerConnection.java
@@ -146,6 +146,7 @@ public class PeerConnection {
     public KeyType keyType;
     public ContinualGatheringPolicy continualGatheringPolicy;
     public int iceCandidatePoolSize;
+    public boolean presumeWritableWhenFullyRelayed;
 
     public RTCConfiguration(List<IceServer> iceServers) {
       iceTransportsType = IceTransportsType.ALL;
@@ -161,6 +162,7 @@ public class PeerConnection {
       keyType = KeyType.ECDSA;
       continualGatheringPolicy = ContinualGatheringPolicy.GATHER_ONCE;
       iceCandidatePoolSize = 0;
+      presumeWritableWhenFullyRelayed = false;
     }
   };