[NaCl SDK] Add HTTP mount.

native_client_sdk/src/examples/hello_nacl_mounts/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.
 
 function moduleDidLoad() {
   common.hideModule();
 }
 
 // Called by the common.js module.
 function domContentLoaded(name, tc, config, width, height) {
@@ skipping 122 matching lines @@
  * @param {string} prefix The prefix to search for in |s|.
  */
 function startsWith(s, prefix) {
   // indexOf would search the entire string, lastIndexOf(p, 0) only checks at
   // the first index. See: http://stackoverflow.com/a/4579228
   return s.lastIndexOf(prefix, 0) === 0;
 }
 
 function logMessage(msg) {
   var logEl = document.getElementById('log');
+
+  // Perform some basic escaping.
+  msg = msg.replace(/&/g, '&')
+           .replace(/</g, '&lt;')
+           .replace(/>/g, '&gt;')
+           .replace(/"/g, '&quot;')
+           .replace(/'/g, '&apos;');
+
   logEl.innerHTML += msg + '<br>';
 }
 
 function makeCall(func) {
   var message = func;
   for (var i = 1; i < arguments.length; ++i) {
     message += '\1' + arguments[i];
   }
 
   return message;
@@ skipping 12 matching lines @@
     var result_func = window[func_result_name];
 
     if (!result_func) {
       logMessage('Error: Bad message received from NaCl module.');
       return;
     }
 
     result_func.apply(null, params.slice(1));
   }
 }