Split out video targets from //sdk/android:base_java.

Bug: webrtc:9048
Change-Id: Icda0fabf41610f99254d244e0b11d321eee345f7
Reviewed-on: https://webrtc-review.googlesource.com/65120
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22752}

sdk/android/src/java/org/webrtc/Empty.java

@@ -0,0 +1,17 @@
+/*
+ *  Copyright 2018 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;
+
+/**
+ * Empty class for use in libjingle_peerconnection_java because all targets require at least one
+ * Java file.
+ */
+class Empty {}