[NaCl SDK] Add HTTP mount.

native_client_sdk/src/examples/hello_nacl_mounts/example.js

Index: native_client_sdk/src/examples/hello_nacl_mounts/example.js
diff --git a/native_client_sdk/src/examples/hello_nacl_mounts/example.js b/native_client_sdk/src/examples/hello_nacl_mounts/example.js
index c2376eaebb4f78edf1165770a942a1199f500186..c355b4d08a426a9351e8ce4ed3d7868ddad9d492 100644
--- a/native_client_sdk/src/examples/hello_nacl_mounts/example.js
+++ b/native_client_sdk/src/examples/hello_nacl_mounts/example.js
@@ -140,6 +140,14 @@ function startsWith(s, prefix) {
 
 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>';
 }