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

mojo/public/bindings/sample/sample_test.js

Index: mojo/public/bindings/sample/sample_test.js
diff --git a/mojo/public/bindings/sample/sample_test.js b/mojo/public/bindings/sample/sample_test.js
index 230f4df51a1d3bee2c6a99fe895c90768452c9d7..e361b85da279490f96062388deb519043f2ff51e 100644
--- a/mojo/public/bindings/sample/sample_test.js
+++ b/mojo/public/bindings/sample/sample_test.js
@@ -3,16 +3,21 @@
 // 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;
@@ -107,6 +112,8 @@ define([
   }
 
   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);