Port the remaining of dart:core to the unified corelib.

corelib/unified/core/implementation/options.dart

Index: corelib/unified/core/implementation/options.dart
diff --git a/lib/dom/src/dart2js_DOMTypeJs.dart b/corelib/unified/core/implementation/options.dart
similarity index 59%
copy from lib/dom/src/dart2js_DOMTypeJs.dart
copy to corelib/unified/core/implementation/options.dart
index a3140905b6899cc154dc7315c7cf99234975806a..8e73424663382ab7e04d99d5c79be240a7b6f9b8 100644
--- a/lib/dom/src/dart2js_DOMTypeJs.dart
+++ b/corelib/unified/core/implementation/options.dart
@@ -2,9 +2,10 @@
 // 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' {
+class RuntimeOptions implements Options {
+  external List<String> get arguments();
 
-  var dartObjectLocalStorage;
+  external String get executable();
 
-  String get typeName() native;
+  external String get script();
 }