Restore partial analysis of analysis options files

pkg/analysis_server/lib/src/analysis_server.dart

Index: pkg/analysis_server/lib/src/analysis_server.dart
diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index be00f35c7e782091a4ee859550aaae7284eea08f..39c43dc68dcb2fdf0dd60cfb28297bb4854c6965 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -1464,6 +1464,10 @@ class ServerContextManagerCallbacks extends ContextManagerCallbacks {
   ServerContextManagerCallbacks(this.analysisServer, this.resourceProvider);
 
   @override
+  NotificationManager get notificationManager =>
+      analysisServer.notificationManager;
+
+  @override
   nd.AnalysisDriver addAnalysisDriver(
       Folder folder, ContextRoot contextRoot, AnalysisOptions options) {
     ContextBuilder builder = createContextBuilder(folder, options);