add support for native methods in class

pkg/analyzer/test/generated/parser_fasta_listener.dart

 // Copyright (c) 2017, 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.
 
 import 'package:front_end/src/fasta/fasta_codes.dart';
 import 'package:front_end/src/fasta/parser/identifier_context.dart'
     show IdentifierContext;
 import 'package:front_end/src/fasta/parser.dart' as fasta;
 import 'package:front_end/src/fasta/scanner/token.dart' as fasta;
 import 'package:front_end/src/fasta/util/link.dart';
@@ skipping 33 matching lines @@
   void expectEmpty() {
     expect(_stack, isEmpty);
   }
 
   void expectIn(String event) {
     if (_stack.isEmpty || _stack.last != event) {
       fail('Expected $event, but found $_stack');
     }
   }
 
+  void expectInOneOf(List<String> events) {
+    if (_stack.isEmpty || !events.contains(_stack.last)) {
+      fail('Expected one of $events, but found $_stack');
+    }
+  }
+
   void end(String event) {
     expectIn(event);
     _stack.removeLast();
   }
 
   ForwardingTestListener(this.listener);
 
   @override
   Uri get uri => listener.uri;
 
@@ skipping 547 matching lines @@
   }
 
   @override
   void endClassBody(int memberCount, Token beginToken, Token endToken) {
     end('ClassBody');
     listener.endClassBody(memberCount, beginToken, endToken);
   }
 
   @override
   void handleNativeClause(Token nativeToken, bool hasName) {
-    expectIn('ClassDeclaration');
+    expectInOneOf(['ClassDeclaration', 'Method']);
     listener.handleNativeClause(nativeToken, hasName);
   }
 
   @override
   void endClassDeclaration(
       int interfacesCount,
       Token beginToken,
       Token classKeyword,
       Token extendsKeyword,
       Token implementsKeyword,
@@ skipping 282 matching lines @@
     listener.endMetadata(beginToken, periodBeforeName, endToken);
   }
 
   @override
   void endMetadataStar(int count, bool forParameter) {
     end('MetadataStar');
     listener.endMetadataStar(count, forParameter);
   }
 
   @override
-  void endMethod(Token getOrSet, Token beginToken, Token endToken) {
+  void endMethod(
+      Token getOrSet, Token beginToken, Token nativeToken, Token endToken) {
     end('Method');
-    listener.endMethod(getOrSet, beginToken, endToken);
+    listener.endMethod(getOrSet, beginToken, nativeToken, endToken);
   }
 
   @override
   void endMixinApplication(Token withKeyword) {
     end('MixinApplication');
     listener.endMixinApplication(withKeyword);
   }
 
   @override
   void endNamedFunctionExpression(Token endToken) {
@@ skipping 609 matching lines @@
         tokenToStartReplacing, tokenWithComment);
     // TODO(danrubel): implement replaceTokenWithGenericCommentTypeAssign
   }
 
   @override
   set suppressParseErrors(bool value) {
     listener.suppressParseErrors = value;
     // TODO(danrubel): implement suppressParseErrors
   }
 }