Mojo's C++ and JavaScript bindings should produce identical messages

mojo/public/bindings/sample/sample_test.js

 // Copyright 2013 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.
 
 define([
+    "console",
+    "mojo/public/bindings/js/test/hexdump",
     "gtest",
     // TODO(abarth): We shouldn't need to depend on codec, but there seems to
     // be a bug in the module loading system whereby this test doesn't run if
     // we don't import codec here.
     "mojo/public/bindings/js/codec",
     "mojo/public/bindings/sample/mojom/sample_service"
-  ], function(gtest, codec, sample) {
+  ], function(console, hexdump, gtest, codec, sample) {
 
   var global = this;
 
+  // Set this variable to true to print the binary message in hex.
+  var dumpMessageAsHex = false;
+
   function makeFoo() {
     var bar = new sample.Bar();
     bar.alpha = 20;
     bar.beta = 40;
     bar.gamma = 60;
 
     var extra_bars = new Array(3);
     for (var i = 0; i < extra_bars.length; ++i) {
       var base = i * 100;
       extra_bars[i] = new sample.Bar();
@@ skipping 74 matching lines @@
     checkFoo(foo);
     gtest.expectTrue(baz, "baz is " + baz);
     gtest.expectEqual(port, 10, "port is " + port);
     global.result = "PASS";
   };
 
   function SimpleMessageReceiver() {
   }
 
   SimpleMessageReceiver.prototype.accept = function(message) {
+    if (dumpMessageAsHex)
+      console.log(hexdump.dumpArray(message.memory));
     // Imagine some IPC happened here.
     var serviceImpl = new ServiceImpl();
     serviceImpl.accept(message);
   };
 
   var receiver = new SimpleMessageReceiver();
   var serviceProxy = new sample.ServiceProxy(receiver);
 
   var foo = makeFoo();
   checkFoo(foo);
 
   var port = 10;
   serviceProxy.frobinate(foo, true, port);
 });