Create fewer unnecessary lists

pkg/analyzer/lib/src/generated/testing/html_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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.testing.html_factory;
 
 import 'package:analyzer/src/generated/html.dart';
@@ skipping 14 matching lines @@
   }
 
   static Token ltToken() {
     return new Token.con1(TokenType.LT, 0);
   }
 
   static Token ltsToken() {
     return new Token.con1(TokenType.LT_SLASH, 0);
   }
 
-  static HtmlScriptTagNode scriptTag(List<XmlAttributeNode> attributes) {
+  static HtmlScriptTagNode scriptTag([List<XmlAttributeNode> attributes = XmlAttributeNode.EMPTY_LIST]) {
     return new HtmlScriptTagNode(
         ltToken(),
         stringToken("script"),
         attributes,
         sgtToken(),
         null,
         null,
         null,
         null);
   }
 
   static HtmlScriptTagNode scriptTagWithContent(String contents,
-      List<XmlAttributeNode> attributes) {
+      [List<XmlAttributeNode> attributes = XmlAttributeNode.EMPTY_LIST]) {
     Token attributeEnd = gtToken();
     Token contentToken = stringToken(contents);
     attributeEnd.setNext(contentToken);
     Token contentEnd = ltsToken();
     contentToken.setNext(contentEnd);
     return new HtmlScriptTagNode(
         ltToken(),
         stringToken("script"),
         attributes,
         attributeEnd,
         null,
         contentEnd,
         stringToken("script"),
         gtToken());
   }
 
   static Token sgtToken() {
     return new Token.con1(TokenType.SLASH_GT, 0);
   }
 
   static Token stringToken(String value) {
     return new Token.con2(TokenType.STRING, 0, value);
   }
 
-  static XmlTagNode tagNode(String name, List<XmlAttributeNode> attributes) {
+  static XmlTagNode tagNode(String name, [List<XmlAttributeNode> attributes = XmlAttributeNode.EMPTY_LIST]) {
     return new XmlTagNode(
         ltToken(),
         stringToken(name),
         attributes,
         sgtToken(),
         null,
         null,
         null,
         null);
   }
 }