[Android] Add a java version of the test server spawner.

net/test/android/javatests/src/org/chromium/net/test/BaseTestServer.java

Index: net/test/android/javatests/src/org/chromium/net/test/BaseTestServer.java
diff --git a/net/test/android/javatests/src/org/chromium/net/test/BaseTestServer.java b/net/test/android/javatests/src/org/chromium/net/test/BaseTestServer.java
new file mode 100644
index 0000000000000000000000000000000000000000..a9ca6bd6173c71caa9109e36a93fed265bc5ef00
--- /dev/null
+++ b/net/test/android/javatests/src/org/chromium/net/test/BaseTestServer.java
@@ -0,0 +1,37 @@
+// 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.test;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/** A base class for simple test servers. */
+public abstract class BaseTestServer implements Runnable {
+    private AtomicBoolean mKeepRunning;
+
+    /** Creates a test server. */
+    public BaseTestServer() {
+        mKeepRunning = new AtomicBoolean(true);
+    }
+
+    /** Accepts incoming connections until stopped via stop(). */
+    public void run() {
+        mKeepRunning.set(true);
+
+        while (mKeepRunning.get()) {
+            accept();
+        }
+    }
+
+    /** Waits for and handles an incoming request. */
+    protected abstract void accept();
+
+    /** Returns the port on which this server is listening for connections. */
+    public abstract int getServerPort();
+
+    /** Stops the server. */
+    public void stop() {
+        mKeepRunning.set(false);
+    }
+}