Make navigation notification operation Source based, without Dart knowledge.

pkg/analysis_server/lib/src/domain_analysis.dart

Index: pkg/analysis_server/lib/src/domain_analysis.dart
diff --git a/pkg/analysis_server/lib/src/domain_analysis.dart b/pkg/analysis_server/lib/src/domain_analysis.dart
index 5dd9feb36d3ad3edcf75194702f2b0764fdeedd8..6b2c3775fe6da06d2422b4e5c0796b88d99d56aa 100644
--- a/pkg/analysis_server/lib/src/domain_analysis.dart
+++ b/pkg/analysis_server/lib/src/domain_analysis.dart
@@ -14,7 +14,7 @@ import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analysis_server/src/domains/analysis/navigation.dart';
 import 'package:analysis_server/src/operation/operation_analysis.dart'
-    show sendAnalysisNotificationNavigation;
+    show NavigationOperation, sendAnalysisNotificationNavigation;
 import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analysis_server/src/services/dependencies/library_dependencies.dart';
 import 'package:analyzer/file_system/file_system.dart';
@@ -347,11 +347,10 @@ class AnalysisDomainImpl implements AnalysisDomain {
   @override
   void scheduleNotification(
       engine.AnalysisContext context, Source source, AnalysisService service) {
-    // TODO(scheglov) schedule, don't do it right now
     String file = source.fullName;
     if (server.hasAnalysisSubscription(service, file)) {
       if (service == AnalysisService.NAVIGATION) {
-        sendAnalysisNotificationNavigation(server, context, source);
+        server.scheduleOperation(new NavigationOperation(context, source));
       }
     }
   }