Generate dart:html bindings for Dartium as well as Frog. All unittests now pass (or are disabled fo…

client/html/generated/html/frog/KeygenElement.dart

+
+class _KeygenElementImpl extends _ElementImpl implements KeygenElement native "*HTMLKeygenElement" {
+
+  bool autofocus;
+
+  String challenge;
+
+  bool disabled;
+
+  final _FormElementImpl form;
+
+  String keytype;
+
+  final _NodeListImpl labels;
+
+  String name;
+
+  final String type;
+
+  final String validationMessage;
+
+  final _ValidityStateImpl validity;
+
+  final bool willValidate;
+
+  bool checkValidity() native;
+
+  void setCustomValidity(String error) native;
+}