Add flakiness check if there is no received packets in a certain period.

talk/examples/android/src/org/appspot/apprtc/PeerConnectionClient.java

 /*
  * libjingle
  * Copyright 2014 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 880 matching lines @@
       });
     }
 
     @Override
     public void onIceGatheringChange(
       PeerConnection.IceGatheringState newState) {
       Log.d(TAG, "IceGatheringState: " + newState);
     }
 
     @Override
+    public void onIceConnectionReceivingChange(boolean receiving) {
+      Log.d(TAG, "IceConnectionReceiving changed to " + receiving);
+    }
+
+    @Override
     public void onAddStream(final MediaStream stream){
       executor.execute(new Runnable() {
         @Override
         public void run() {
           if (peerConnection == null || isError) {
             return;
           }
           if (stream.audioTracks.size() > 1 || stream.videoTracks.size() > 1) {
             reportError("Weird-looking stream: " + stream);
             return;
@@ skipping 108 matching lines @@
     public void onCreateFailure(final String error) {
       reportError("createSDP error: " + error);
     }
 
     @Override
     public void onSetFailure(final String error) {
       reportError("setSDP error: " + error);
     }
   }
 }