Implement automatically generated constructors for frog and dartium dart:html

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

Index: client/dom/templates/html/frog/factoryprovider_AudioElement.darttemplate
diff --git a/client/dom/templates/html/frog/factoryprovider_AudioElement.darttemplate b/client/dom/templates/html/frog/factoryprovider_AudioElement.darttemplate
new file mode 100644
index 0000000000000000000000000000000000000000..f547f196d970972813adefe8698f13fb216a3155
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+++ b/client/dom/templates/html/frog/factoryprovider_AudioElement.darttemplate
@@ -0,0 +1,11 @@
+// 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 $FACTORYPROVIDER {
+  factory AudioElement([String src = null]) native
+'''
+if (src == null) return new Audio();
+return new Audio(src);
+''';
+}