Implement AstBuilder integration for parenthesized expressions.

pkg/analyzer/lib/src/fasta/resolution_applier.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.
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/type.dart';
 
 /// Visitor that applies resolution data from the front end (obtained via
 /// [ResolutionStorer]) to an analyzer AST.
@@ skipping 27 matching lines @@
   @override
   void visitMethodInvocation(MethodInvocation node) {
     node.target?.accept(this);
     // TODO(paulberry): store resolution of node.methodName.
     // TODO(paulberry): store resolution of node.typeArguments.
     node.argumentList.accept(this);
     node.staticType = _getTypeFor(node.methodName);
   }
 
   @override
+  void visitParenthesizedExpression(ParenthesizedExpression node) {
+    node.visitChildren(this);
+    node.staticType = node.expression.staticType;
+  }
+
+  @override
   void visitVariableDeclaration(VariableDeclaration node) {
     if (node.parent is VariableDeclarationList &&
         node.parent.parent is TopLevelVariableDeclaration) {
       // Don't visit the name; resolution for it will come from the outline.
     } else {
       node.name.accept(this);
     }
     node.initializer?.accept(this);
   }
 
@@ skipping 50 matching lines @@
   DartType _getTypeFor(AstNode node) {
     if (_debug) print('Getting type for $node');
     if (node.offset != _typeOffsets[_typeIndex]) {
       throw new StateError(
           'Expected a type for analyzer offset ${node.offset}; got one for '
           'kernel offset ${_typeOffsets[_typeIndex]}');
     }
     return super._getTypeFor(node);
   }
 }