Add hooks for changing priorities of warnings to errors in strong mode

pkg/analyzer/lib/src/generated/error.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 analyzer.src.generated.error;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart' show AstNode;
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/source/error_processor.dart';
 import 'package:analyzer/src/dart/element/type.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart' show ScannerErrorCode;
+import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/generated/shared_messages.dart'
     as shared_messages;
 import 'package:analyzer/src/generated/java_core.dart';
 import 'package:analyzer/src/generated/parser.dart' show ParserErrorCode;
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/task/model.dart';
 import 'package:analyzer/task/model.dart';
 import 'package:source_span/source_span.dart';
 
 /**
@@ skipping 5670 matching lines @@
    * Parameters:
    * 0: the name of the constant that is missing
    */
   static const StaticWarningCode MISSING_ENUM_CONSTANT_IN_SWITCH =
       const StaticWarningCode(
           'MISSING_ENUM_CONSTANT_IN_SWITCH',
           "Missing case clause for '{0}'",
           "Add a case clause for the missing constant or add a default clause.");
 
   /**
+   * A flag indicating whether this warning is an error when running with strong
+   * mode enabled.
+   */
+  final bool isStrongModeError;
+
+  /**
    * Initialize a newly created error code to have the given [name]. The message
    * associated with the error will be created from the given [message]
    * template. The correction associated with the error will be created from the
    * given [correction] template.
    */
-  const StaticWarningCode(String name, String message, [String correction])
+  const StaticWarningCode(String name, String message,
+      [String correction, this.isStrongModeError = false])
       : super(name, message, correction);
 
   @override
   ErrorSeverity get errorSeverity => ErrorType.STATIC_WARNING.severity;
 
   @override
   ErrorType get type => ErrorType.STATIC_WARNING;
 }
 
 /**
@@ skipping 26 matching lines @@
    * Initialize a newly created error code to have the given [name].
    */
   const TodoCode(String name) : super(name, "{0}");
 
   @override
   ErrorSeverity get errorSeverity => ErrorSeverity.INFO;
 
   @override
   ErrorType get type => ErrorType.TODO;
 }