Add Event and EventTest

remoting/android/javatests/src/org/chromium/chromoting/Counter.java

+// Copyright 2016 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.chromoting;
+
+/**
+ * A pointer of an integer, users can {@link set} / {@link get} / {@link increment} /
+ * {@link decrement} to its value. This class is usually useful in test cases. This class is not
+ * thread-safe, for a thread-safe implementation, use
+ * {@link java.util.concurrent.atomic.AtomicInteger}.
+ */
+public class Counter {
+    private int mV;
+
+    public Counter() {
+        set(0);
+    }
+
+    public void increment() {
+        mV++;
+    }
+
+    public void decrement() {
+        mV--;
+    }
+
+    public void set(int v) {
+        mV = v;
+    }
+
+    public int get() {
+        return mV;
+    }
+}