Add network tester client [android]

webrtc/tools/network_tester/androidapp/src/com/google/media/networktester/NetworkTester.java

+/*
+ *  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 com.google.media.networktester;
+
+public class NetworkTester extends Thread {
+  private native static long CreateTestController();
+  private native static void TestControllerConnect(long testController);
+  private native static void TestControllerRun(long testController);
+  private native static boolean TestControllerIsDone(long testController);
+  private native static void DestroyTestController(long testController);
+  static {
+    System.loadLibrary("network_tester_so");
+  }
+
+  @Override
+  public void run() {
+    final long testController = CreateTestController();
+    TestControllerConnect(testController);
+    while (!Thread.interrupted() && !TestControllerIsDone(testController)) {
+      TestControllerRun(testController);
+    }
+    DestroyTestController(testController);
+  }
+}