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

[Lambros, 2016/05/27 22:26:07]

Grammar nit: Replace first , with ;

[Hzj_jie, 2016/05/28 00:32:07]

Done.

+ * {@link java.util.concurrent.atomic.AtomicInteger}.
+ */
+public class Counter {

[Lambros, 2016/05/27 22:26:07]

Put this in a 'util' sub-package, and maybe call it MutableInteger.
See https://www.chromium.org/developers/testing/android-tests
under "Utility test classes".

[Hzj_jie, 2016/05/28 00:32:07]

Done.

+    private int mV;

[Lambros, 2016/05/27 22:26:07]

'mValue' preferred (and 'value' for parameters).
It's OK to make this field public, if you prefer.
If you do this, the field should be named 'value' (no 'm' prefix, begin with
lower-case letter).

[Hzj_jie, 2016/05/28 00:32:07]

Done.

+
+    public Counter() {
+        set(0);
+    }
+
+    public void increment() {
+        mV++;
+    }
+
+    public void decrement() {
+        mV--;
+    }
+
+    public void set(int v) {
+        mV = v;
+    }
+
+    public int get() {
+        return mV;
+    }
+}