Add Throbber control for DOMUI. Use it everywhere in options and in Sync setup UI.

chrome/browser/resources/options/options.html

Index: chrome/browser/resources/options/options.html
diff --git a/chrome/browser/resources/options/options.html b/chrome/browser/resources/options/options.html
index 8ae6db49cf7d54c07a0069481da0c85ed1b1a698..af48a7e7b35e69e24610145bb7757114efd9aef0 100644
--- a/chrome/browser/resources/options/options.html
+++ b/chrome/browser/resources/options/options.html
@@ -9,6 +9,7 @@
 
 <link rel="icon" href="../../../app/theme/settings_favicon.png">
 <link rel="stylesheet" href="chrome://resources/css/list.css">
+<link rel="stylesheet" href="chrome://resources/css/throbber.css">
 <link rel="stylesheet" href="chrome://resources/css/tree.css">
 <link rel="stylesheet" href="../dom_ui.css">
 <link rel="stylesheet" href="options_page.css">
@@ -54,6 +55,7 @@
 <script src="chrome://resources/js/cr/ui/list_single_selection_model.js"></script>
 <script src="chrome://resources/js/cr/ui/list_item.js"></script>
 <script src="chrome://resources/js/cr/ui/list.js"></script>
+<script src="chrome://resources/js/cr/ui/throbber.js"></script>
 <script src="chrome://resources/js/cr/ui/tree.js"></script>
 <script src="chrome://resources/js/local_strings.js"></script>
 <script src="chrome://resources/js/util.js"></script>