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

chrome/browser/resources/shared/css/throbber.css

Index: chrome/browser/resources/shared/css/throbber.css
diff --git a/chrome/browser/resources/shared/css/throbber.css b/chrome/browser/resources/shared/css/throbber.css
new file mode 100644
index 0000000000000000000000000000000000000000..404b9c2cb10776768d41f7e3c1f904234bb52500
--- /dev/null
+++ b/chrome/browser/resources/shared/css/throbber.css
@@ -0,0 +1,7 @@
+.throbber {
+  display: inline-block;
+  background-image: url("../../../../../app/resources/throbber.png");

[James Hawkins, 2011/01/19 20:34:58]

Alphabetize properties.

[Sergey Ulanov, 2011/01/20 02:00:49]

Done.

+  width: 16px;
+  height: 16px;
+  background-position: 0px;

[James Hawkins, 2011/01/19 20:34:58]

s/px/0/

[Sergey Ulanov, 2011/01/20 02:00:49]

Done.

+}