preload polymer elements in options page

chrome/browser/resources/options/chromeos/quick_unlock_configure_overlay.js

Index: chrome/browser/resources/options/chromeos/quick_unlock_configure_overlay.js
diff --git a/chrome/browser/resources/options/chromeos/quick_unlock_configure_overlay.js b/chrome/browser/resources/options/chromeos/quick_unlock_configure_overlay.js
index 2cf087de38d83b60bcdb0432931189f7203ecbef..6e461404674a9ba555e5a909d6bd0619ecdc22f3 100644
--- a/chrome/browser/resources/options/chromeos/quick_unlock_configure_overlay.js
+++ b/chrome/browser/resources/options/chromeos/quick_unlock_configure_overlay.js
@@ -30,6 +30,9 @@ cr.define('options', function() {
       $('screen-lock-done').onclick = function() {
         QuickUnlockConfigureOverlay.dismiss();
       };
+
+      if (loadTimeData.getBoolean('enablePolymerPreload'))
+        requestIdleCallback(this.ensurePolymerIsLoaded_.bind(this));
     },
 
     /** @override */