annotated_run: extract robust_tempdir so it can be shared with kitchen_run

scripts/slave/unittests/robust_tempdir_test.py

+#!/usr/bin/env python
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import unittest
+
+import test_env  # pylint: disable=W0403,W0611
+
+from slave import robust_tempdir
+
+
+class RobustTempdirTest(unittest.TestCase):
+  def test_empty(self):
+    with robust_tempdir.RobustTempdir(prefix='robust_tempdir_test'):
+      pass
+
+  def test_basic(self):
+    with robust_tempdir.RobustTempdir(prefix='robust_tempdir_test') as rt:
+      path = rt.tempdir()
+      self.assertTrue(os.path.exists(path))
+
+    self.assertFalse(os.path.exists(path))
+
+  def test_leak(self):
+    with robust_tempdir.RobustTempdir(
+        prefix='robust_tempdir_test', leak=True) as rt:
+      path = rt.tempdir()
+      self.assertTrue(os.path.exists(path))
+
+    self.assertTrue(os.path.exists(path))
+    os.rmdir(path)
+
+
+if __name__ == '__main__':
+  unittest.main()