Import rasta tests.

pkg/fasta/test/rasta/unsupported_platform_library.dart

Index: pkg/fasta/test/rasta/unsupported_platform_library.dart
diff --git a/pkg/fasta/test/rasta/unsupported_platform_library.dart b/pkg/fasta/test/rasta/unsupported_platform_library.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ca1de9bd5f7a6c3bc1f8b53693122dbe8819d6e0
--- /dev/null
+++ b/pkg/fasta/test/rasta/unsupported_platform_library.dart
@@ -0,0 +1,6 @@
+// Copyright (c) 2016, 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.md file.
+
+import 'dart:html';
+import 'dart:io';