Server custom error severity support (#24452).

pkg/analysis_server/lib/src/operation/operation_analysis.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library operation.analysis;
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/computer/computer_highlights.dart';
 import 'package:analysis_server/src/computer/computer_highlights2.dart';
 import 'package:analysis_server/src/computer/computer_outline.dart';
@@ skipping 133 matching lines @@
       // notification.
       return;
     }
     server.prevAnalyzedFiles = analyzedFiles;
     protocol.AnalysisAnalyzedFilesParams params =
         new protocol.AnalysisAnalyzedFilesParams(analyzedFiles.toList());
     server.sendNotification(params.toNotification());
   });
 }
 
-void sendAnalysisNotificationErrors(AnalysisServer server, String file,
-    LineInfo lineInfo, List<AnalysisError> errors) {
+void sendAnalysisNotificationErrors(
+    AnalysisServer server,
+    AnalysisContext context,
+    String file,
+    LineInfo lineInfo,
+    List<AnalysisError> errors) {
   _sendNotification(server, () {
     if (errors == null) {
       errors = <AnalysisError>[];
     }
     var serverErrors =
-        protocol.doAnalysisError_listFromEngine(lineInfo, errors);
+        protocol.doAnalysisError_listFromEngine(context, lineInfo, errors);
     var params = new protocol.AnalysisErrorsParams(file, serverErrors);
     server.sendNotification(params.toNotification());
   });
 }
 
 void sendAnalysisNotificationFlushResults(
     AnalysisServer server, List<String> files) {
   _sendNotification(server, () {
     if (files != null && files.isNotEmpty) {
       var params = new protocol.AnalysisFlushResultsParams(files);
@@ skipping 335 matching lines @@
       AnalysisContext context, String file, this.lineInfo, this.errors)
       : super(context, file);
 
   @override
   ServerOperationPriority get priority {
     return ServerOperationPriority.ANALYSIS_NOTIFICATION;
   }
 
   @override
   void perform(AnalysisServer server) {
-    sendAnalysisNotificationErrors(server, file, lineInfo, errors);
+    sendAnalysisNotificationErrors(server, context, file, lineInfo, errors);
   }
 }
 
 abstract class _NotificationOperation extends SourceSensitiveOperation {
   final Source source;
 
   _NotificationOperation(AnalysisContext context, this.source) : super(context);
 
   @override
   ServerOperationPriority get priority {
     return ServerOperationPriority.ANALYSIS_NOTIFICATION;
   }
 
   @override
   bool shouldBeDiscardedOnSourceChange(Source source) {
     return source == this.source;
   }
 }
 
 abstract class _SingleFileOperation extends SourceSensitiveOperation {
   final String file;
 
   _SingleFileOperation(AnalysisContext context, this.file) : super(context);
 
   @override
   bool shouldBeDiscardedOnSourceChange(Source source) {
     return source.fullName == file;
   }
 }