Update analysis.errors notification to the newest spec.

pkg/analysis_server/lib/src/constants.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 constants;
 
 //
 // Server methods
 //
 const String SERVER_GET_VERSION = 'server.getVersion';
@@ skipping 75 matching lines @@
 const String FILE = 'file';
 const String FILES = 'files';
 const String FIXES = 'fixes';
 const String FLAGS = 'flags';
 const String ID = 'id';
 const String INCLUDED = 'included';
 const String IS_ABSTRACT = 'isAbstract';
 const String IS_STATIC = 'isStatic';
 const String KIND = 'kind';
 const String LENGTH = 'length';
+const String LOCATION = 'location';
 const String MESSAGE = 'message';
 const String NAME = 'name';
 const String NEW_LENGTH = 'newLength';
 const String OFFSET = 'offset';
 const String OLD_LENGTH = 'oldLength';
 const String OPTIONS = 'options';
 const String OUTLINE = 'outline';
 const String PARAMETERS = 'parameters';
 const String PATTERN = 'pattern';
 const String REFACTORINGS = 'refactorings';
 const String REGIONS = 'regions';
 const String REMOVED = 'removed';
 const String RETURN_TYPE = 'returnType';
+const String SEVERITY = 'severity';
+const String START_COLUMN = 'startColumn';
+const String START_LINE = 'startLine';
 const String SUBSCRIPTIONS = 'subscriptions';
 const String TARGETS = 'targets';
 const String TYPE = 'type';
 const String VERSION = 'version';
 
 //
 // Analysis option names
 //
 const String ANALYZE_ANGULAR = 'analyzeAngular'; // boolean
 const String ANALYZE_POLYMER = 'analyzePolymer'; // boolean
 const String ENABLE_ASYNC = 'enableAsync'; // boolean
 const String ENABLE_DEFERRED_LOADING = 'enableDeferredLoading'; // boolean
 const String ENABLE_ENUMS = 'enableEnums'; // boolean
 const String GENERATE_DART2JS_HINTS = 'generateDart2jsHints'; // boolean
 const String GENERATE_HINTS = 'generateHints'; // boolean