cache pub list results

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 e665f06f210309c770ad7fdbed3d689d21777424..8da6499475a35f82046944321b7dc9ee7f24d0a8 100644
--- a/pkg/analysis_server/lib/src/socket_server.dart
+++ b/pkg/analysis_server/lib/src/socket_server.dart
@@ -10,9 +10,9 @@ import 'package:analysis_server/src/plugin/server_plugin.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/index/local_file_index.dart';
+import 'package:analysis_server/src/source/caching_pub_package_map_provider.dart';
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
-import 'package:analyzer/source/pub_package_map_provider.dart';
 import 'package:analyzer/src/generated/sdk_io.dart';
 
 
@@ -73,7 +73,7 @@ class SocketServer {
     analysisServer = new AnalysisServer(
         serverChannel,
         resourceProvider,
-        new PubPackageMapProvider(resourceProvider, defaultSdk),
+        new CachingPubPackageMapProvider(resourceProvider, defaultSdk),
         index,
         analysisServerOptions,
         defaultSdk,