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

chrome/browser/resources/chromeos/idle_logout_dialog.css

Index: chrome/browser/resources/chromeos/idle_logout_dialog.css
diff --git a/chrome/browser/resources/chromeos/idle_logout_dialog.css b/chrome/browser/resources/chromeos/idle_logout_dialog.css
new file mode 100644
index 0000000000000000000000000000000000000000..03395ad01407663e260f28b6988919c7f45fb687
--- /dev/null
+++ b/chrome/browser/resources/chromeos/idle_logout_dialog.css
@@ -0,0 +1,28 @@
+/* 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.
+ */
+
+html, body {
+  font-family: Arial, Helvetica, sans-serif;
+  font-size: 13px;
+  height: 100%;
+  margin: 0;
+  overflow: hidden;
+  width: 100%;
+}
+
+#main-box {
+  border: 1px solid black;
+}
+
+#title {
+  background: -webkit-linear-gradient(left, white, #dadada);
+  border-bottom: 1px solid #bbb;
+  font-weight: bold;
+  padding: 10px;
+}
+
+#warning {
+  padding: 10px;
+}