Converting the email_this_page sample extension to manifest_version 2

chrome/common/extensions/docs/examples/extensions/email_this_page/options.js

Index: chrome/common/extensions/docs/examples/extensions/email_this_page/options.js
diff --git a/chrome/common/extensions/docs/examples/extensions/email_this_page/options.js b/chrome/common/extensions/docs/examples/extensions/email_this_page/options.js
new file mode 100644
index 0000000000000000000000000000000000000000..2c682a4653c64a2d589ba2281bc5a8a05da79ebc
--- /dev/null
+++ b/chrome/common/extensions/docs/examples/extensions/email_this_page/options.js
@@ -0,0 +1,37 @@
+// 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.
+
+var gmail = "https://mail.google.com/mail/?extsrc=mailto&url=%s";
+
+function toggle(radioButton) {
+  if (window.localStorage == null) {
+    alert('Local storage is required for changing providers');
+    return;
+  }
+  if (document.getElementById('gmail').checked) {
+    window.localStorage.customMailtoUrl = gmail;
+  } else {
+    window.localStorage.customMailtoUrl = "";
+  }
+}
+
+function main() {
+  if (window.localStorage == null) {
+    alert("LocalStorage must be enabled for changing options.");
+    document.getElementById('default').disabled = true;
+    document.getElementById('gmail').disabled = true;
+    return;
+  }
+
+  // Default handler is checked. If we've chosen another provider, we must
+  // change the checkmark.
+  if (window.localStorage.customMailtoUrl == gmail)
+    document.getElementById('gmail').checked = true;
+}
+
+document.addEventListener('DOMContentLoaded', function () {
+  main();
+  document.querySelector('#default').addEventListener('click', toggle);
+  document.querySelector('#gmail').addEventListener('click', toggle);
+});