Fixing SelectElement.options, adding support for optgroup.

tools/dom/templates/html/impl/impl_HTMLSelectElement.darttemplate

Index: tools/dom/templates/html/impl/impl_HTMLSelectElement.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_HTMLSelectElement.darttemplate b/tools/dom/templates/html/impl/impl_HTMLSelectElement.darttemplate
index 2f1b90a7d916a40647a68baabbd0d98c95be0e1f..4099cd1e71df83f9914c4105824ee4c52e935cc5 100644
--- a/tools/dom/templates/html/impl/impl_HTMLSelectElement.darttemplate
+++ b/tools/dom/templates/html/impl/impl_HTMLSelectElement.darttemplate
@@ -10,7 +10,8 @@ $!MEMBERS
   // Override default options, since IE returns SelectElement itself and it
   // does not operate as a List.
   List<OptionElement> get options {
-    var options = this.children.where((e) => e is OptionElement).toList();
+    var options =
+        this.queryAll('option').where((e) => e is OptionElement).toList();
     return new UnmodifiableListView(options);
   }