Small fix to perf.dart.

pkg/front_end/tool/perf_test.dart

 // Copyright (c) 2016, 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.
 
 /// The only purpose of this file is to enable analyzer tests on `perf.dart`,
 /// the code here just has a dummy import to the rest of the code.
 library front_end.tool.perf_test;
 
+import 'dart:io' show Platform;
 import 'perf.dart' as m;
 
-main() => print('done ${m.inputSize}');
+main() async {
+  var benchIds = [
+    'scan',
+    'parse',
+    'kernel_gen_e2e',
+    'kernel_gen_e2e_sum',
+    'linked_summarize'
+  ];
+  var inputFile = Platform.script.resolve('../lib/file_system.dart').path;
+  for (var id in benchIds) {
+    await m.main([id, inputFile]);
+  }
+}