Add JavaScript AST.

lib/compiler/implementation/js/js.dart

Index: lib/compiler/implementation/js/js.dart
diff --git a/lib/compiler/implementation/js/js.dart b/lib/compiler/implementation/js/js.dart
new file mode 100644
index 0000000000000000000000000000000000000000..433352ff4ae1ad5ea75aa724b4392f7231e2b84f
--- /dev/null
+++ b/lib/compiler/implementation/js/js.dart
@@ -0,0 +1,15 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// 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.
+
+#library('js');
+
+#import("precedence.dart");
+#import("../util/characters.dart", prefix: "charCodes");
+
+// TODO(floitsch): remove this dependency (currently necessary for the
+// CodeBuffer).
+#import('../leg.dart', prefix: "leg");
+
+#source('nodes.dart');
+#source('printer.dart');