Automatically generate most constructors

client/dom/generated/src/frog/_HTMLOptionElementFactoryProvider.dart

Index: client/dom/generated/src/frog/_HTMLOptionElementFactoryProvider.dart
diff --git a/client/dom/generated/src/frog/_HTMLOptionElementFactoryProvider.dart b/client/dom/generated/src/frog/_HTMLOptionElementFactoryProvider.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ec92839968b5ff968cce8eb0dd4ec028298d9011
--- /dev/null
+++ b/client/dom/generated/src/frog/_HTMLOptionElementFactoryProvider.dart
@@ -0,0 +1,16 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+class _HTMLOptionElementFactoryProvider {
+  factory HTMLOptionElement([String data = null, String value = null,
+                             bool defaultSelected = null, bool selected = null])
+      native
+'''
+if (data == null) return new Option();
+if (value == null) return new Option(data);
+if (defaultSelected == null) return new Option(data, value);
+if (selected == null) return new Option(data, value, defaultSelected);
+return new Option(data, value, defaultSelected, selected);
+''';
+}