Create Login UI for Demo User.

chrome/browser/resources/chromeos/login/demo_user_login.css

Index: chrome/browser/resources/chromeos/login/demo_user_login.css
diff --git a/chrome/browser/resources/chromeos/login/demo_user_login.css b/chrome/browser/resources/chromeos/login/demo_user_login.css
new file mode 100644
index 0000000000000000000000000000000000000000..07fc214c9f49c4ae9f48536e9749d13d235698b5
--- /dev/null
+++ b/chrome/browser/resources/chromeos/login/demo_user_login.css
@@ -0,0 +1,41 @@
+/* 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 {
+  height: 100%;
+  width: 100%;
+}
+
+body {
+  margin: 0;
+  overflow: hidden;
+  padding: 0;
+}
+
+#page {
+  -webkit-box-align: center;
+  -webkit-box-pack: center;
+  background: -webkit-linear-gradient(top, #dadada, white);
+  display: -webkit-box;
+  height: 100%;
+  position: absolute;
+  width: 100%;
+}
+
+#logo-container {
+  text-align: center;
+}
+
+#logo {
+  width: 150px;
+}
+
+#demo-login-text {
+  font-family: 'Open Sans';
+  font-size: 18px;
+  font-weight: bold;
+  padding-top: 80px;
+}