Server custom error severity support (#24452).

pkg/analysis_server/lib/src/domain_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 domain.analysis;
 
 import 'dart:async';
 import 'dart:core' hide Resource;
 
 import 'package:analysis_server/plugin/analysis/analysis_domain.dart';
@@ skipping 47 matching lines @@
       return new Response.getErrorsInvalidFile(request);
     }
     completionFuture.then((AnalysisDoneReason reason) {
       switch (reason) {
         case AnalysisDoneReason.COMPLETE:
           engine.AnalysisErrorInfo errorInfo = server.getErrors(file);
           List<AnalysisError> errors;
           if (errorInfo == null) {
             server.sendResponse(new Response.getErrorsInvalidFile(request));
           } else {
-            errors = doAnalysisError_listFromEngine(
+            engine.AnalysisContext context = server.getAnalysisContext(file);
+            errors = doAnalysisError_listFromEngine(context,
                 errorInfo.lineInfo, errorInfo.errors);
             server.sendResponse(
                 new AnalysisGetErrorsResult(errors).toResponse(request.id));
           }
           break;
         case AnalysisDoneReason.CONTEXT_REMOVED:
           // The active contexts have changed, so try again.
           Response response = getErrors(request);
           if (response != Response.DELAYED_RESPONSE) {
             server.sendResponse(response);
@@ skipping 321 matching lines @@
       context.onResultComputed(descriptor).listen((result) {
         StreamController<engine.ComputedResult> controller =
             controllers[result.descriptor];
         if (controller != null) {
           controller.add(result);
         }
       });
     }
   }
 }