anchor.diff:          .where((info) => info != null));
   
       return new ProgramInfo(
  -        compilationDuration: compiler.totalCompileTime.elapsedTicks,
  +        compilationDuration: compiler.totalCompileTime.elapsed,
           // TODO (sigurdm): Also count the size of deferred code
           size: compiler.assembledCode.length,
           libraries: libraryInfos,
  
positive.code:   /// The time the compilation took place.
    final DateTime compilationMoment;
  
    /// The time the compilation took to complite.
    final int compilationDuration;
  
    /// The version of dart2js used to compile the program.
    final String dart2jsVersion;
  
negative.code:     buffer.writeln(h2('Compilation took place: '
                        '${info.compilationMoment}'));
      buffer.writeln(h2('Compilation took: '
                        '${info.compilationDuration.inSeconds} seconds'));
      buffer.writeln(h2('Output size: ${info.size} bytes'));
      if (info.dart2jsVersion != null) {
        buffer.writeln(h2('Dart2js version: ${info.dart2jsVersion}'));
  