gdata: Add authentication status section to chrome:drive-internals

chrome/browser/resources/chromeos/drive_internals.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.
 
-// To be implemented. crbug.com/135328
+/**
+ * Updates the Authentication Status section.
+ * @param {Object} auth_status Dictionary containing auth status.
+ */
+function UpdateAuthStatus(auth_status) {
+  $('has-refresh-token').textContent = auth_status['has-refresh-token'];
+  $('has-access-token').textContent = auth_status['has-access-token'];
+}
+
+document.addEventListener('DOMContentLoaded', function() {
+  chrome.send('pageLoaded');
+});