Add Cronet Test App that uses libcronet_tests.so with net test utilities.

components/cronet/android/test/src/org/chromium/cronet_test_apk/CronetTestUtil.java

Index: components/cronet/android/test/src/org/chromium/cronet_test_apk/CronetTestUtil.java
diff --git a/components/cronet/android/test/src/org/chromium/cronet_test_apk/CronetTestUtil.java b/components/cronet/android/test/src/org/chromium/cronet_test_apk/CronetTestUtil.java
new file mode 100644
index 0000000000000000000000000000000000000000..60c5befc0f4260dd74603a6f0d67e0e4bc54e267
--- /dev/null
+++ b/components/cronet/android/test/src/org/chromium/cronet_test_apk/CronetTestUtil.java
@@ -0,0 +1,23 @@
+// Copyright 2014 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.cronet_test_apk;
+
+import org.chromium.base.JNINamespace;
+
+/**
+ * Utilities for Cronet testing
+ */
+@JNINamespace("cronet")
+public class CronetTestUtil {
+    /**
+      * Start QUIC server on local host and return its port number. Return 0 if
+      * failed.

[mmenke, 2014/09/11 21:10:17]

@returns

[mmenke, 2014/09/11 21:10:17]

Also, maybe "Returns non-zero value on success." would be clearer (Otherwise,
I'm left wondering what it returns on success - is it a specific value or not)

[mef, 2014/09/11 22:03:25]

Done.

+      */

[mmenke, 2014/09/11 21:10:17]

nit:  Fix indent

[mef, 2014/09/11 22:03:25]

Done.

+    public static int startQuicServer() {
+        return nativeStartQuicServer();
+    }
+
+    private static native int nativeStartQuicServer();
+}