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

client/html/generated/html/frog/ButtonElement.dart

+
+class _ButtonElementImpl extends _ElementImpl implements ButtonElement native "*HTMLButtonElement" {
+
+  bool autofocus;
+
+  bool disabled;
+
+  final _FormElementImpl form;
+
+  String formAction;
+
+  String formEnctype;
+
+  String formMethod;
+
+  bool formNoValidate;
+
+  String formTarget;
+
+  final _NodeListImpl labels;
+
+  String name;
+
+  final String type;
+
+  final String validationMessage;
+
+  final _ValidityStateImpl validity;
+
+  String value;
+
+  final bool willValidate;
+
+  bool checkValidity() native;
+
+  void setCustomValidity(String error) native;
+}