Parenthesize expressions as needed in elements text dump.

pkg/analyzer/test/src/summary/resynthesize_kernel_test.dart

 // Copyright (c) 2017, 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.test.src.summary.resynthesize_kernel_test;
 
 import 'dart:async';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_ast_factory.dart';
@@ skipping 550 matching lines @@
   test_const_topLevel_identical() async {
     await super.test_const_topLevel_identical();
   }
 
   @failingTest
   test_const_topLevel_ifNull() async {
     await super.test_const_topLevel_ifNull();
   }
 
   @failingTest
+  test_const_topLevel_parenthesis() async {
+    await super.test_const_topLevel_parenthesis();
+  }
+
+  @failingTest
   test_const_topLevel_prefix() async {
     await super.test_const_topLevel_prefix();
   }
 
   @failingTest
   test_const_topLevel_super() async {
     await super.test_const_topLevel_super();
   }
 
   @failingTest
@@ skipping 1870 matching lines @@
   }
 
   /**
    * Get the [Source] object for the given [uri].
    */
   Source _getSource(String uri) {
     return _sources.putIfAbsent(
         uri, () => _analysisContext.sourceFactory.forUri(uri));
   }
 }