Enable the Java wrapper to load different .so library.

webrtc/sdk/android/api/org/webrtc/PeerConnectionFactory.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;
 
 import java.util.List;
 
 /**
  * Java wrapper for a C++ PeerConnectionFactoryInterface.  Main entry point to
  * the PeerConnection API for clients.
  */
 public class PeerConnectionFactory {
   private static volatile boolean nativeLibLoaded;
 
   static {
+    String libraryName = "jingle_peerconnection_so";
     try {
-      System.loadLibrary("jingle_peerconnection_so");
+      Class.forName("org.webrtc.PeerConnectionLibraryDataChannelOnly");
+      libraryName = "jingle_peerconnection_datachannel_only.so";
+    } catch (Exception e) {
+      System.out.println("Failed to load jingle_peerconnection_datachannel_only_so.");
+    }
+
+    try {
+      System.loadLibrary(libraryName);
       nativeLibLoaded = true;
     } catch (UnsatisfiedLinkError t) {
       nativeLibLoaded = false;
     }
   }
 
   private static final String TAG = "PeerConnectionFactory";
   private final long nativeFactory;
   private static Thread networkThread;
   private static Thread workerThread;
@@ skipping 234 matching lines @@
 
   @Deprecated public native void nativeSetOptions(long nativeFactory, Options options);
 
   private static native void nativeSetVideoHwAccelerationOptions(
       long nativeFactory, Object localEGLContext, Object remoteEGLContext);
 
   private static native void nativeThreadsCallbacks(long nativeFactory);
 
   private static native void nativeFreeFactory(long nativeFactory);
 }