Enable the Java wrapper to load different .so library.

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

Index: webrtc/sdk/android/api/org/webrtc/PeerConnectionLibraryDataChannelOnly.java
diff --git a/webrtc/sdk/android/api/org/webrtc/PeerConnectionLibraryDataChannelOnly.java b/webrtc/sdk/android/api/org/webrtc/PeerConnectionLibraryDataChannelOnly.java
new file mode 100644
index 0000000000000000000000000000000000000000..65eb16831d812e28abdd1fb670e3e9bd982f922a
--- /dev/null
+++ b/webrtc/sdk/android/api/org/webrtc/PeerConnectionLibraryDataChannelOnly.java
@@ -0,0 +1,13 @@
+/*
+ *  Copyright 2017 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;
+
+public class PeerConnectionLibraryDataChannelOnly {}