Add GN targets for AppRTC Demo on Android.

third_party/autobanh/BUILD.gn

Index: third_party/autobanh/BUILD.gn
diff --git a/BUILD.gn b/third_party/autobanh/BUILD.gn
similarity index 64%
copy from BUILD.gn
copy to third_party/autobanh/BUILD.gn
index b7f7a0619a9a73591c070aee611224ec6a544f79..d5f6b0f2d6a043aa2b439e30648e39cbd5bc20d1 100644
--- a/BUILD.gn
+++ b/third_party/autobanh/BUILD.gn
@@ -1,4 +1,4 @@
-# Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+# Copyright (c) 2016 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
@@ -6,9 +6,8 @@
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
-# This file is copied and modified from Chromium (src/BUILD.gn).
-group("root") {
-  deps = [
-    "//webrtc",
-  ]
+import("//build/config/android/rules.gni")
+
+android_java_prebuilt("autobanh_java") {
+  jar_path = "lib/autobanh.jar"
 }