[NaCl SDK] Make the SDK examples buildable as a packaged app.

native_client_sdk/src/examples/hello_world_interactive/example.js

 // Copyright (c) 2012 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.
 
 // Called by the common.js module.
 function moduleDidLoad() {
   // The module is not hidden by default so we can easily see if the plugin
   // failed to load.
   common.hideModule();
 }
 
 // Called by the common.js module.
 function attachListeners() {
   document.getElementById('fortyTwo').addEventListener('click', fortyTwo);
   document.getElementById('reverseText').addEventListener('click', reverseText);
 }
 
 function fortyTwo() {
   common.naclModule.postMessage('fortyTwo');
 }
 
 function reverseText() {
   // Grab the text from the text box, pass it into reverseText()
   var inputBox = document.getElementById('inputBox');
   common.naclModule.postMessage('reverseText:' + inputBox.value);
 }
 
-// Called by the common.js module.
-function handleMessage(message_event) {
-  alert(message_event.data);
+function handleMessage(e) {
+  if (typeof e.data === 'string') {
+    // Received a reversed message.
+    common.logMessage('Received "' + e.data + '"\n');
+  } else if (typeof e.data === 'number') {
+    // Recived 42.
+    common.logMessage('Received "' + e.data + '"\n');
+  }
 }