add support for x-dart-test link tags in the new test package

lib/transformer.dart

 // Copyright (c) 2015, 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.
 
 /// Transformer used for pub serve and pub build
 library web_components.transformer;
 
 import 'package:barback/barback.dart';
 
 export 'build/html_import_annotation_recorder.dart';
 import 'build/import_inliner.dart';
 export 'build/import_inliner.dart';
 import 'build/script_compactor.dart';
 export 'build/script_compactor.dart';
+import 'build/test_compatibility.dart';
+export 'build/test_compatibility.dart';
 import 'build/web_components.dart';
 export 'build/web_components.dart';
 
 /// The Web Components transformer group, which internally runs several phases
 /// that:
 ///   * Extract inlined script tags into separate files.
 ///   * Extract script tags from entry points and all html imports and add them
 ///     as dart imports in a new *.bootstrap.dart file.
 ///   * Run the `initialize` transformer.
 ///   * Inlines @HtmlImport annotations as html imports into the entry point.
 ///   * Inline imported html files and remove all but the main dart script tag.
 ///
 /// At the end of these phases, this tranformer produces a single entrypoint
 /// HTML file with a single Dart script that can later be compiled with dart2js.
 class WebComponentsTransformerGroup implements TransformerGroup {
   final Iterable<Iterable> phases;
 
   WebComponentsTransformerGroup(TransformOptions options)
       : phases = createDeployPhases(options);
 
   WebComponentsTransformerGroup.asPlugin(BarbackSettings settings)
       : this(_parseSettings(settings));
 }
 
 /// Create deploy phases for web_components.
 List<List<Transformer>> createDeployPhases(TransformOptions options,
     {String sdkDir}) {
   var phases = [];
 
+  /// Must happen first, temporarily rewrites <link rel="x-dart-test"> tags to
+  /// <script type="application/dart" _was_test></script> tags.
+  phases.add([new RewriteXDartTestToScript(options.entryPoints)]);
+
   // Must happen before the WebComponents transformer, grabs all dart scripts
   // and combines them into one bootstrap file.
   phases.add([new ScriptCompactorTransformer(options.entryPoints)]);
 
   // Runs the customized version of the `initialize` transformer and inlines
   // @HtmlImport annotations.
   phases.add([new WebComponentsTransformer(options)]);
 
   // Inlines all html imports and removes all dart script tags in the process.
   phases.add([new ImportInlinerTransformer(options.entryPoints)]);
+
+  /// Must happen last, rewrites
+  /// <script type="application/dart" _was_test></script> tags to
+  /// <link rel="x-dart-test"> tags.
+  phases.add([new RewriteScriptToXDartTest(options.entryPoints)]);
   return phases;
 }
 
 /// Options used by web_components transformers
 class TransformOptions {
   /// List of entrypoints paths. The paths are relative to the package root and
   /// are represented using posix style, which matches the representation used
   /// in asset ids in barback. If null, any html file under 'web/' or 'test/' is
   /// considered an entry point.
   final List<String> entryPoints;
@@ skipping 38 matching lines @@
     error = false;
   } else {
     error = true;
   }
   if (error) {
     print('Bad value for "entry_points" in the web_components transformer. '
         'Expected either one String or a list of Strings.');
   }
   return files;
 }