Adding a router class to handle messages that expect responses.

mojo/android/javatests/src/org/chromium/mojo/TestUtils.java

 // 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.mojo;
 
 import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
 import java.util.Random;
 
 /**
  * Utilities methods for tests.
  */
 public final class TestUtils {
 
     private static final Random RANDOM = new Random();
 
     /**
      * Returns a new direct ByteBuffer of the given size with random (but reproducible) data.
      */
     public static ByteBuffer newRandomBuffer(int size) {
         byte bytes[] = new byte[size];
         RANDOM.setSeed(size);
         RANDOM.nextBytes(bytes);
         ByteBuffer data = ByteBuffer.allocateDirect(size);
+        data.order(ByteOrder.nativeOrder());
         data.put(bytes);
         data.flip();
         return data;
     }
 
 }