ppapi: PPB_VpnProvider: Add a simple NaCl SDK example.

native_client_sdk/src/examples/api/vpn_provider/example.js

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.

[binji, 2016/02/24 19:23:08]

2016, and remove (c)

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This function is called by common.js when the NaCl module is
+// loaded.
+function moduleDidLoad() {
+  // Once we load, hide the plugin. In this example, we don't display anything
+  // in the plugin, so it is fine to hide it.
+  common.hideModule();
+
+  // After the NaCl module has loaded, common.naclModule is a reference to the
+  // NaCl module's <embed> element.
+  //
+  // postMessage sends a message to it.
+  // common.naclModule.postMessage('hello');
+}
+
+function load_me() {

[binji, 2016/02/24 19:23:08]

nit: loadMe (and unloadMe below)

+  common.naclModule.postMessage('hello');
+
+  document.getElementById("load").disabled = true;
+  document.getElementById("unload").disabled = false;
+}
+function unload_me() {
+  common.naclModule.postMessage('bye');
+
+  document.getElementById("load").disabled = false;
+  document.getElementById("unload").disabled = true;
+}
+
+// This function is called by common.js when a message is received from the
+// NaCl module.
+function handleMessage(message) {
+  var logEl = document.getElementById('log');
+  logEl.textContent += message.data;
+}