Add the beginnings of a Dart wrapper for libarchive.

utils/archive/dart_archive.h

Index: utils/archive/dart_archive.h
diff --git a/lib/dom/src/dart2js_DOMTypeJs.dart b/utils/archive/dart_archive.h
similarity index 60%
copy from lib/dom/src/dart2js_DOMTypeJs.dart
copy to utils/archive/dart_archive.h
index a3140905b6899cc154dc7315c7cf99234975806a..67bb916e81acf57d6c5e98497502f2a0d6d42c76 100644
--- a/lib/dom/src/dart2js_DOMTypeJs.dart
+++ b/utils/archive/dart_archive.h
@@ -2,9 +2,11 @@
 // 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 _DOMTypeJs implements DOMType native '*DOMType' {
+#ifndef DART_ARCHIVE_H_
+#define DART_ARCHIVE_H_
 
-  var dartObjectLocalStorage;
+#include "dart_api.h"
+#include "archive.h"
+#include "archive_entry.h"
 
-  String get typeName() native;
-}
+#endif  // DART_ARCHIVE_H_