fix bug in scriptcompactors bootstrap and added transform function which can be used by other trans…

test/build/transformer_test.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.
 library web_components.test.build.transformer_test;
 
 import 'package:code_transformers/tests.dart';
 import 'package:web_components/transformer.dart';
 import 'package:unittest/compact_vm_config.dart';
 import 'common.dart';
 
@@ skipping 85 matching lines @@
           i0.main();
         }
         ''',
     'a|web/index.bootstrap.dart': '''
         library a.web.index_bootstrap_dart;
 
         import 'index.html.0.dart' as i0;
         import 'package:b/foo.dart' as i1;
         import 'index.dart' as i2;
 
-        void main() => i2.main();
+        void main() { i2.main(); }
         ''',
     'a|web/index.html.0.dart': '''
         // Must use package:urls inside inline script tags,
         @HtmlImport('package:b/bar_nodart.html')
         library b.bar;
 
         import 'package:web_components/html_import_annotation.dart';
 
         import 'package:initialize/initialize.dart';
 
         @initMethod
         bar() {}
         ''',
   }, [], StringFormatter.noNewlinesOrSurroundingWhitespace);
 }