Setting up benchmarks and perf utilities

test/perf/input/perf_common.dart

Index: test/perf/input/perf_common.dart
diff --git a/test/perf/input/perf_common.dart b/test/perf/input/perf_common.dart
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+// 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.
+
+/**
+ * Collects several functions used by all performance tests, and reexports the
+ * base classes from which all benchmarks extend.
+ */
+library perf_common;
+
+import 'dart:html';
+export 'package:benchmark_harness/benchmark_harness.dart';
+export 'async_benchmark.dart';
+
+void perfDone(num score) {
+  var str = (score > 100) ? score.toStringAsFixed(0) : score.toStringAsFixed(2);
+  print('benchmark-score: $str');
+  window.postMessage('done', '*');
+}