Add AnalysisContext.onResultInvalidated(descriptor).

pkg/analysis_server/lib/plugin/analysis/analysis_domain.dart

Index: pkg/analysis_server/lib/plugin/analysis/analysis_domain.dart
diff --git a/pkg/analysis_server/lib/plugin/analysis/analysis_domain.dart b/pkg/analysis_server/lib/plugin/analysis/analysis_domain.dart
index 821a81e1769b7a5c5067f5649c8ff34d3d6ce468..f790b05be5b3182b727cf05fa36804a340f21d3f 100644
--- a/pkg/analysis_server/lib/plugin/analysis/analysis_domain.dart
+++ b/pkg/analysis_server/lib/plugin/analysis/analysis_domain.dart
@@ -33,7 +33,7 @@ import 'package:analysis_server/plugin/protocol/protocol.dart'
     show AnalysisService;
 import 'package:analysis_server/src/plugin/server_plugin.dart';
 import 'package:analyzer/src/generated/engine.dart'
-    show AnalysisContext, ComputedResult;
+    show AnalysisContext, ResultChangedEvent;
 import 'package:analyzer/src/generated/source.dart' show Source;
 import 'package:analyzer/task/model.dart' show ResultDescriptor;
 import 'package:plugin/plugin.dart';
@@ -69,7 +69,7 @@ abstract class AnalysisDomain {
    * needed to send a notification to the client because some data was now
    * invalidated.
    */
-  Stream<ComputedResult> onResultComputed(ResultDescriptor result);
+  Stream<ResultChangedEvent> onResultChanged(ResultDescriptor result);
 
   /**
    * Schedule sending the given [service] notifications for the given [source]