Wrap Directory.watch on linux for the watcher package.

pkg/watcher/test/ready/linux_test.dart

Index: pkg/watcher/test/ready/linux_test.dart
diff --git a/pkg/watcher/test/ready/linux_test.dart b/pkg/watcher/test/ready/linux_test.dart
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+// Copyright (c) 2013, 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.
+
+import 'package:scheduled_test/scheduled_test.dart';
+import 'package:watcher/src/directory_watcher/linux.dart';
+import 'package:watcher/watcher.dart';
+
+import 'shared.dart';
+import '../utils.dart';
+
+main() {
+  initConfig();
+
+  watcherFactory = (dir) => new LinuxDirectoryWatcher(dir);
+
+  setUp(createSandbox);
+
+  sharedTests();
+}