Send 'analysis.errors' notification only for files in analysis roots.

pkg/analysis_server/test/analysis/test_all.dart

 // Copyright (c) 2014, 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 test.analysis;
 
 import 'package:unittest/unittest.dart';
 
 import 'get_errors_test.dart' as get_errors_test;
+import 'notification_errors_test.dart' as notification_errors_test;
 
 /**
  * Utility for manually running all tests.
  */
 main() {
   groupSep = ' | ';
   group('search', () {
     get_errors_test.main();
+    notification_errors_test.main();
   });
 }