Roll Observatory packages and add a roll script

packages/web_components/test/build/mirrors_remover_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.mirrors_remover_test;
+
+import 'package:code_transformers/tests.dart';
+import 'package:web_components/build/mirrors_remover.dart';
+import 'package:unittest/compact_vm_config.dart';
+import 'package:unittest/unittest.dart';
+
+main() {
+  useCompactVMConfiguration();
+
+  var transformer = new MirrorsRemoverTransformer();
+  var phases = [[transformer]];
+
+  testPhases('basic', phases, {
+    'a|lib/src/init.dart': '''
+        libary web_components.init;
+
+        import 'src/mirror_initializer.dart' as init;
+        export 'src/mirror_initializer.dart' show deployMode;
+
+        foo() {}
+        ''',
+  }, {
+    'a|lib/src/init.dart': '''
+        libary web_components.init;
+
+        import 'src/static_initializer.dart' as init;
+        export 'src/static_initializer.dart' show deployMode;
+
+        foo() {}
+        ''',
+  }, []);
+}