Implement automatically generated constructors for frog and dartium dart:html

client/dom/templates/html/frog/factoryprovider.darttemplate

Index: client/dom/templates/html/frog/factoryprovider.darttemplate
diff --git a/client/html/generated/html/interface/AudioElement.dart b/client/dom/templates/html/frog/factoryprovider.darttemplate
similarity index 63%
copy from client/html/generated/html/interface/AudioElement.dart
copy to client/dom/templates/html/frog/factoryprovider.darttemplate
index 42a2a861a2bd9563c017d6b0ab2cf33bcb0d6d3e..ae013a9d0dbe6f8788b87c8c4aebefda2cf3238c 100644
--- a/client/html/generated/html/interface/AudioElement.dart
+++ b/client/dom/templates/html/frog/factoryprovider.darttemplate
@@ -2,7 +2,7 @@
 // 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.
 
-// WARNING: Do not edit - generated code.
-
-interface AudioElement extends MediaElement {
+class $FACTORYPROVIDER {
+  factory $CONSTRUCTOR($PARAMETERS) native
+      '''return new $NAMED_CONSTRUCTOR($ARGUMENTS);''';
 }