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

pkg/analysis_server/test/domain_search_test.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.domain.search;
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/domain_search.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/resource.dart';
 import 'package:unittest/unittest.dart';
 
 import 'mocks.dart';
 
 main() {
   groupSep = ' | ';
 
   MockServerChannel serverChannel;
   MemoryResourceProvider resourceProvider;
   AnalysisServer server;
   SearchDomainHandler handler;
 
   setUp(() {
     serverChannel = new MockServerChannel();
     resourceProvider = new MemoryResourceProvider();
-    server = new AnalysisServer(serverChannel, resourceProvider);
+    server = new AnalysisServer(
+        serverChannel, resourceProvider, new MockPackageMapProvider());
     server.defaultSdk = new MockSdk();
     handler = new SearchDomainHandler(server);
   });
 
   group('SearchDomainHandler', () {
     test('findElementReferences', () {
       var request = new Request('0', SEARCH_FIND_ELEMENT_REFERENCES);
       request.setParameter(FILE, null);
       request.setParameter(OFFSET, null);
       var response = handler.handleRequest(request);
@@ skipping 19 matching lines @@
 
     test('findTopLevelDeclarations', () {
       var request = new Request('0', SEARCH_FIND_TOP_LEVEL_DECLARATIONS);
       request.setParameter(PATTERN, null);
       var response = handler.handleRequest(request);
       // TODO(brianwilkerson) implement
       //expect(response, isNull);
     });
   });
 }