Implement the auto-logout on idle feature for Kiosk mode.

chrome/browser/resources/chromeos/idle_logout_dialog.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.
+
+var timeToRestart;
+var localStrings;
+var countdownTimer;
+
+/**
+ * Decrements the countdown timer and updates the display on the dialog.
+ */
+function decrementTimer() {
+  if (timeToRestart >= 0) {
+    $('warning').innerHTML = localStrings.getStringF('warning',

[arv (Not doing code reviews), 2012/03/02 00:15:33]

Why innerHTML instead of textContent? Why is this not done using i18n attribute?

[rkc, 2012/03/02 01:20:56]

Because we need to keep updating the text. Also, since we have HTML in the text,
we need to set the innerHTML, textContent doesn't work.

+                                                     timeToRestart);
+    --timeToRestart;

[arv (Not doing code reviews), 2012/03/02 00:15:33]

prefer post decr in js

[arv (Not doing code reviews), 2012/03/02 00:15:33]

This does not seem quite right. How about checking how much time has passed
instead?

[rkc, 2012/03/02 01:20:56]

Done.

[rkc, 2012/03/02 01:20:56]

This code is no longer there.

Done.

+  } else {
+    clearInterval(countdownTimer);
+    chrome.send('requestLogout');
+  }
+}
+
+function startCountdown(seconds) {
+  timeToRestart = seconds;
+  countdownTimer = setInterval(decrementTimer, 1000);
+}
+
+/**
+ * Inserts translated strings on loading.
+ */
+function initialize() {
+  localStrings = new LocalStrings();
+
+  i18nTemplate.process(document, templateData);
+  chrome.send('requestCountdown');
+}
+
+document.addEventListener('DOMContentLoaded', initialize);