Add 'withKeyword' to mixin application with Fasta.

pkg/front_end/lib/src/fasta/source/outline_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.outline_builder;
 
 import 'package:kernel/ast.dart' show AsyncMarker, ProcedureKind;
 
 import '../parser/parser.dart' show FormalParameterType, optional;
 
@@ skipping 300 matching lines @@
     int modifiers =
         Modifier.validate(pop(), isAbstract: bodyKind == MethodBody.Abstract);
     List<MetadataBuilder> metadata = pop();
     library.addProcedure(metadata, modifiers, returnType, name, typeVariables,
         formals, asyncModifier, kind, beginToken.charOffset, nativeMethodName,
         isTopLevel: false);
     nativeMethodName = null;
   }
 
   @override
-  void endMixinApplication() {
+  void endMixinApplication(Token withKeyword) {
     debugEvent("MixinApplication");
     List<TypeBuilder> mixins = pop();
     TypeBuilder supertype = pop();
     push(library.addMixinApplication(supertype, mixins, -1));
   }
 
   @override
   void beginNamedMixinApplication(Token begin, Token name) {
     library.beginNestedDeclaration(name.value, hasMembers: false);
   }
@@ skipping 347 matching lines @@
   Link<Token> handleMemberName(Link<Token> identifiers) {
     if (!isDartLibrary || identifiers.isEmpty) return identifiers;
     return removeNativeClause(identifiers);
   }
 
   @override
   void debugEvent(String name) {
     // printEvent(name);
   }
 }