Parse factory constructors 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 582 matching lines @@
     push(library.addConstructorReference(
         name, typeArguments, suffix, start.charOffset));
   }
 
   @override
   void beginFactoryMethod(Token token) {
     library.beginNestedDeclaration(null, hasMembers: false);
   }
 
   @override
-  void endFactoryMethod(Token beginToken, Token endToken) {
+  void endFactoryMethod(
+      Token beginToken, Token factoryKeyword, Token endToken) {
     debugEvent("FactoryMethod");
     MethodBody kind = pop();
     ConstructorReferenceBuilder redirectionTarget;
     if (kind == MethodBody.RedirectingFactoryBody) {
       redirectionTarget = pop();
     }
     AsyncMarker asyncModifier = pop();
     List<FormalParameterBuilder> formals = pop();
     var name = pop();
     int modifiers = Modifier.validate(pop());
@@ skipping 85 matching lines @@
   Link<Token> handleMemberName(Link<Token> identifiers) {
     if (!isDartLibrary || identifiers.isEmpty) return identifiers;
     return removeNativeClause(identifiers);
   }
 
   @override
   void debugEvent(String name) {
     // printEvent(name);
   }
 }