Add an AST factory method for fieldDeclaration with all optional named parameters.

pkg/analyzer/lib/src/generated/testing/ast_test_factory.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.testing.ast_test_factory;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_ast_factory.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 453 matching lines @@
 
   static ExpressionStatement expressionStatement(Expression expression) =>
       astFactory.expressionStatement(
           expression, TokenFactory.tokenFromType(TokenType.SEMICOLON));
 
   static ExtendsClause extendsClause(TypeName type) => astFactory.extendsClause(
       TokenFactory.tokenFromKeyword(Keyword.EXTENDS), type);
 
   static FieldDeclaration fieldDeclaration(bool isStatic, Keyword keyword,
           TypeAnnotation type, List<VariableDeclaration> variables) =>
-      astFactory.fieldDeclaration(
-          null,
-          null,
-          isStatic ? TokenFactory.tokenFromKeyword(Keyword.STATIC) : null,
-          variableDeclarationList(keyword, type, variables),
-          TokenFactory.tokenFromType(TokenType.SEMICOLON));
+      astFactory.fieldDeclaration2(
+          staticKeyword:
+              isStatic ? TokenFactory.tokenFromKeyword(Keyword.STATIC) : null,
+          fieldList: variableDeclarationList(keyword, type, variables),
+          semicolon: TokenFactory.tokenFromType(TokenType.SEMICOLON));
 
   static FieldDeclaration fieldDeclaration2(bool isStatic, Keyword keyword,
           List<VariableDeclaration> variables) =>
       fieldDeclaration(isStatic, keyword, null, variables);
 
   static FieldFormalParameter fieldFormalParameter(
           Keyword keyword, TypeAnnotation type, String identifier,
           [FormalParameterList parameterList]) =>
       astFactory.fieldFormalParameter(
           null,
@@ skipping 826 matching lines @@
           expression,
           TokenFactory.tokenFromType(TokenType.SEMICOLON));
 
   static YieldStatement yieldStatement(Expression expression) =>
       astFactory.yieldStatement(
           TokenFactory.tokenFromTypeAndString(TokenType.IDENTIFIER, "yield"),
           null,
           expression,
           TokenFactory.tokenFromType(TokenType.SEMICOLON));
 }