Use "pub list-package-dirs" to resolve package URIs in analysis server.

pkg/analysis_server/lib/src/socket_server.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 socket.server;
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/channel.dart';
 import 'package:analysis_server/src/domain_analysis.dart';
 import 'package:analysis_server/src/domain_completion.dart';
 import 'package:analysis_server/src/domain_edit.dart';
 import 'package:analysis_server/src/domain_search.dart';
 import 'package:analysis_server/src/domain_server.dart';
+import 'package:analysis_server/src/package_map_provider.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/resource.dart';
 
 /**
  * Instances of the class [SocketServer] implement the common parts of
  * http-based and stdio-based analysis servers.  The primary responsibility of
  * the SocketServer is to manage the lifetime of the AnalysisServer and to
  * encode and decode the JSON messages exchanged with the client.
  */
 class SocketServer {
   /**
    * The analysis server that was created when a client established a
    * connection, or `null` if no such connection has yet been established.
    */
   AnalysisServer analysisServer;
 
   /**
    * Create an analysis server which will communicate with the client using the
    * given serverChannel.
    */
   void createAnalysisServer(ServerCommunicationChannel serverChannel) {
     if (analysisServer != null) {
       RequestError error = new RequestError.serverAlreadyStarted();
       serverChannel.sendResponse(new Response('', error));
       serverChannel.listen((Request request) {
         serverChannel.sendResponse(new Response(request.id, error));
       });
       return;
     }
+    PhysicalResourceProvider resourceProvider = PhysicalResourceProvider.INSTANCE;
     analysisServer = new AnalysisServer(
         serverChannel,
-        PhysicalResourceProvider.INSTANCE,
+        resourceProvider,
+        new PubPackageMapProvider(resourceProvider),
         rethrowExceptions: false);
     _initializeHandlers(analysisServer);
   }
 
   /**
    * Initialize the handlers to be used by the given [server].
    */
   void _initializeHandlers(AnalysisServer server) {
     server.handlers = [
         new ServerDomainHandler(server),
         new AnalysisDomainHandler(server),
         new EditDomainHandler(server),
         new SearchDomainHandler(server),
         new CompletionDomainHandler(server),
     ];
   }
 
 }