Use pub list-package-dirs in analyzer command line

pkg/analyzer/lib/source/package_map_provider.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 package.map.provider;
+library source.package_map_provider;
 
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:io' as io;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/sdk_io.dart';
 import 'package:path/path.dart';
 
@@ skipping 145 matching lines @@
    */
   PackageMapInfo _error(Folder folder) {
     // Even if an error occurs, we still need to know the dependencies, so that
     // we'll know when to try running "pub list-package-dirs" again.
     // Unfortunately, "pub list-package-dirs" doesn't tell us dependencies when
     // an error occurs, so just assume there is one dependency, "pubspec.lock".
     List<String> dependencies = <String>[join(folder.path, PUBSPEC_LOCK_NAME)];
     return new PackageMapInfo(null, dependencies.toSet());
   }
 }