Revert "Remove unused option in server API"

pkg/analysis_server/lib/src/socket_server.dart

Index: pkg/analysis_server/lib/src/socket_server.dart
diff --git a/pkg/analysis_server/lib/src/socket_server.dart b/pkg/analysis_server/lib/src/socket_server.dart
index 81a36ef0d4b099212a5663e0b6c12df468521ae6..887e1b730b06b51c4482d80d5e6966e306ac0a7c 100644
--- a/pkg/analysis_server/lib/src/socket_server.dart
+++ b/pkg/analysis_server/lib/src/socket_server.dart
@@ -12,6 +12,7 @@ import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
 import 'package:analyzer/plugin/resolver_provider.dart';
+import 'package:analyzer/source/pub_package_map_provider.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:plugin/plugin.dart';
 
@@ -88,8 +89,15 @@ class SocketServer {
       index = createMemoryIndex();
     }
 
-    analysisServer = new AnalysisServer(serverChannel, resourceProvider, index,
-        serverPlugin, analysisServerOptions, sdkManager, instrumentationService,
+    analysisServer = new AnalysisServer(
+        serverChannel,
+        resourceProvider,
+        new PubPackageMapProvider(resourceProvider, defaultSdk),
+        index,
+        serverPlugin,
+        analysisServerOptions,
+        sdkManager,
+        instrumentationService,
         fileResolverProvider: fileResolverProvider,
         packageResolverProvider: packageResolverProvider,
         useSingleContextManager: useSingleContextManager,