Translate Java's @Override into Dart's @override.

pkg/analyzer/test/generated/ast_test.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.ast_test;
 
 import 'package:analyzer/src/generated/java_core.dart';
@@ skipping 1086 matching lines @@
       });
     });
   }
 }
 
 class BreadthFirstVisitor_BreadthFirstVisitorTest_testIt extends BreadthFirstVisitor<Object> {
   List<AstNode> nodes;
 
   BreadthFirstVisitor_BreadthFirstVisitorTest_testIt(this.nodes) : super();
 
+  @override
   Object visitNode(AstNode node) {
     nodes.add(node);
     return super.visitNode(node);
   }
 }
 
 class NodeListTest extends EngineTestCase {
   void test_add() {
     AstNode parent = AstFactory.argumentList([]);
     AstNode firstNode = AstFactory.booleanLiteral(true);
@@ skipping 2969 matching lines @@
   NodeLocatorTest.dartSuite();
   ToSourceVisitorTest.dartSuite();
   BreadthFirstVisitorTest.dartSuite();
   ClassDeclarationTest.dartSuite();
   IndexExpressionTest.dartSuite();
   NodeListTest.dartSuite();
   SimpleIdentifierTest.dartSuite();
   SimpleStringLiteralTest.dartSuite();
   VariableDeclarationTest.dartSuite();
 }