Move dromaeo to third_party

samples/third_party/dromaeo/common/BenchUtil.dart

 // Copyright (c) 2011, 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.
 
 // Misc benchmark-related utility functions.
 
 class BenchUtil {
   static int get now() {
     return new Date.now().value;
   }
@@ skipping 62 matching lines @@
     for (Match match in new RegExp(pattern).allMatches(s)) {
       sb.add(s.substring(pos, match.start()));
       sb.add(replacement(match));
       pos = match.end();
     }
     sb.add(s.substring(pos));
 
     return sb.toString();
   }
 }