added plugin transformer which initializers can extend to do additional post-processing during tran…

test/initializer_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.
 @initializeTracker
 library initialize.initializer_test;
 
 import 'foo.dart';
 import 'bar.dart';
 import 'package:initialize/src/initialize_tracker.dart';
 import 'package:initialize/initialize.dart';
 import 'package:test_package/foo.dart';
 import 'package:unittest/unittest.dart';
 import 'package:unittest/compact_vm_config.dart';
 
 main() {
   useCompactVMConfiguration();
 
   // Run all initializers.
   run().then((_) {
     test('annotations are seen in post-order with superclasses first', () {
       var expectedNames = [
         const LibraryIdentifier(#test_package.bar, 'test_package', 'bar.dart'),
-        const LibraryIdentifier(#test_package.foo, 'test_package','foo.dart'),
+        const LibraryIdentifier(#test_package.foo, 'test_package', 'foo.dart'),
         const LibraryIdentifier(#initialize.test.foo, null, 'foo.dart'),
         foo,
         fooBar,
         Foo,
         const LibraryIdentifier(#initialize.test.bar, null, 'bar.dart'),
         bar,
         Bar,
         const LibraryIdentifier(
             #initialize.initializer_test, null, 'initializer_test.dart'),
         zap,
@@ skipping 14 matching lines @@
 }
 
 @initializeTracker
 class Zoop {}
 
 @initializeTracker
 class Zap extends Zoop {}
 
 @initializeTracker
 zap() {}