Added .scss transform

pkg/csslib/test/transform/common.dart

 // Copyright (c) 2013, 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 polymer.test.transfom.common;
 
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 import 'package:stack_trace/stack_trace.dart';
 import 'package:unittest/unittest.dart';
 
 String idToString(AssetId id) => '${id.package}|${id.path}';

[Siggi Cherem (dart-lang), 2013/09/08 20:31:33]

please add a TODO about deleting this file (since it's a copy of
polymer/test/transform/common.dart) and mention dartbug.com/12519

 AssetId idFromString(String s) {
   int index = s.indexOf('|');
   return new AssetId(s.substring(0, index), s.substring(index + 1));
 }
 
 /**
  * A helper package provider that has files stored in memory, also wraps
  * [Barback] to simply our tests.
  */
 class TestHelper implements PackageProvider {
@@ skipping 67 matching lines @@
     Map<String, String> inputFiles, Map<String, String> expectedFiles) {
   test(testName, () {
     var helper = new TestHelper(phases, inputFiles)..run();
     return helper.checkAll(expectedFiles).then((_) => helper.tearDown());
   });
 }
 
 const SHADOW_DOM_TAG =
     '<script src="packages/shadow_dom/shadow_dom.min.js"></script>\n';
 
 const INTEROP_TAG = '<script src="packages/browser/interop.js"></script>\n';

[Siggi Cherem (dart-lang), 2013/09/08 20:31:33]

delete these two constants (you probably don't need them)