Add 'withKeyword' to mixin application with Fasta.

pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart

 // Copyright (c) 2016, 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 fasta.analyzer.ast_builder;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast_factory.dart' show AstFactory;
 import 'package:analyzer/dart/ast/standard_ast_factory.dart' as standard;
 import 'package:analyzer/dart/ast/token.dart' as analyzer show Token;
@@ skipping 1038 matching lines @@
         typeParameters,
         extendsClause,
         withClause,
         implementsClause,
         toAnalyzerToken(body.beginToken),
         body.members,
         toAnalyzerToken(body.endToken)));
   }
 
   @override
-  void endMixinApplication() {
+  void endMixinApplication(Token withKeyword) {
     debugEvent("MixinApplication");
     List<TypeName> mixinTypes = pop();
-    // TODO(paulberry,ahe): the parser doesn't give us enough information to
-    // locate the "with" keyword.
-    Token withKeyword;
     TypeName supertype = pop();
     push(new _MixinApplication(supertype, withKeyword, mixinTypes));
   }
 
   @override
   void endNamedMixinApplication(Token beginToken, Token classKeyword,
       Token equalsToken, Token implementsKeyword, Token endToken) {
     debugEvent("NamedMixinApplication");
     ImplementsClause implementsClause;
     if (implementsKeyword != null) {
@@ skipping 428 matching lines @@
       } else if (identical('static', s)) {
         staticKeyword = token;
       } else if (identical('var', s)) {
         finalConstOrVarKeyword = token;
       } else {
         internalError('Unhandled modifier: $s');
       }
     }
   }
 }