[Cronet] Switch from InstrumentationTest to junit

net/test/android/javatests/src/org/chromium/net/test/util/NetworkChangeNotifierTestUtil.java

Index: net/test/android/javatests/src/org/chromium/net/test/util/NetworkChangeNotifierTestUtil.java
diff --git a/net/test/android/javatests/src/org/chromium/net/test/util/NetworkChangeNotifierTestUtil.java b/net/test/android/javatests/src/org/chromium/net/test/util/NetworkChangeNotifierTestUtil.java
new file mode 100644
index 0000000000000000000000000000000000000000..c4f00bd0c6afcc9bac32e26a9929c50849e1213d
--- /dev/null
+++ b/net/test/android/javatests/src/org/chromium/net/test/util/NetworkChangeNotifierTestUtil.java
@@ -0,0 +1,25 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.net;
+
+import org.chromium.base.ThreadUtils;
+
+import java.util.concurrent.FutureTask;
+
+/**
+ * A utility class useful for testing NetworkChangeNotifier.
+ */
+public class NetworkChangeNotifierTestUtil {
+    /**
+     * Flushes UI thread task queue.
+     */
+    public static void flushUiThreadTaskQueue() throws Exception {
+        FutureTask<Void> task = new FutureTask<Void>(new Runnable() {
+            public void run() {}
+        }, null);
+        ThreadUtils.postOnUiThread(task);
+        task.get();
+    }
+}