ChromeOS: Update styles of material design OOBE.

chrome/browser/resources/chromeos/login/oobe_dialog.js

Index: chrome/browser/resources/chromeos/login/oobe_dialog.js
diff --git a/chrome/browser/resources/chromeos/login/oobe_dialog.js b/chrome/browser/resources/chromeos/login/oobe_dialog.js
index 2a1e08369107d41e3db4fc7be9cf090be1889874..9496e39dc8a9002dd7b349a1ebe2c4f0377ec9a2 100644
--- a/chrome/browser/resources/chromeos/login/oobe_dialog.js
+++ b/chrome/browser/resources/chromeos/login/oobe_dialog.js
@@ -13,5 +13,14 @@ Polymer({
       type: Boolean,
       value: false,
     },
+
+    /**
+     * Switches styles to "Welcome screen".
+     */
+    welcomeScreen: {
+      type: Boolean,
+      value: false,
+      reflectToAttribute: true,
+    },
   },
 });