Add summary support for annotations.

pkg/analyzer/lib/src/generated/testing/ast_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_factory;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/dart/ast/ast.dart';
 import 'package:analyzer/src/generated/scanner.dart';
@@ skipping 17 matching lines @@
       new AdjacentStrings(strings);
 
   static Annotation annotation(Identifier name) => new Annotation(
       TokenFactory.tokenFromType(TokenType.AT), name, null, null, null);
 
   static Annotation annotation2(Identifier name,
           SimpleIdentifier constructorName, ArgumentList arguments) =>
       new Annotation(
           TokenFactory.tokenFromType(TokenType.AT),
           name,
-          TokenFactory.tokenFromType(TokenType.PERIOD),
+          constructorName == null
+              ? null
+              : TokenFactory.tokenFromType(TokenType.PERIOD),
           constructorName,
           arguments);
 
   static ArgumentList argumentList([List<Expression> arguments]) =>
       new ArgumentList(TokenFactory.tokenFromType(TokenType.OPEN_PAREN),
           arguments, TokenFactory.tokenFromType(TokenType.CLOSE_PAREN));
 
   static AsExpression asExpression(Expression expression, TypeName type) =>
       new AsExpression(
           expression, TokenFactory.tokenFromKeyword(Keyword.AS), type);
@@ skipping 1212 matching lines @@
           expression,
           TokenFactory.tokenFromType(TokenType.SEMICOLON));
 
   static YieldStatement yieldStatement(Expression expression) =>
       new YieldStatement(
           TokenFactory.tokenFromTypeAndString(TokenType.IDENTIFIER, "yield"),
           null,
           expression,
           TokenFactory.tokenFromType(TokenType.SEMICOLON));
 }