Support parsing of enums in dart2js.

sdk/lib/_internal/compiler/implementation/tree/unparser.dart

Index: sdk/lib/_internal/compiler/implementation/tree/unparser.dart
diff --git a/sdk/lib/_internal/compiler/implementation/tree/unparser.dart b/sdk/lib/_internal/compiler/implementation/tree/unparser.dart
index 288b31a8f26771466b4933141f38f78dae896d55..c929e9281a645f0442d153ed51002fa6f9737c3c 100644
--- a/sdk/lib/_internal/compiler/implementation/tree/unparser.dart
+++ b/sdk/lib/_internal/compiler/implementation/tree/unparser.dart
@@ -124,6 +124,13 @@ class Unparser extends Indentation implements Visitor {
     write('}');
   }
 
+  visitEnum(Enum node) {
+    sb.write('enum ');
+    visit(node.name);

[floitsch, 2014/11/06 12:41:58]

Why don't we need "{" and "}" here?

[Johnni Winther, 2014/11/06 12:49:41]

It is in the NodeList [names].

+    sb.write(' ');
+    visit(node.names);
+  }
+
   visitClassNode(ClassNode node) {
     unparseClassWithBody(node, node.body.nodes);
   }