recipe engine: add remote_run command

unittests/remote_run_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 subprocess
+import sys
+import unittest
+
+import repo_test_util
+
+
+class RemoteRunTest(repo_test_util.RepoTest):
+  def test_basic(self):
+    repos = self.repo_setup({'a': []})
+    self.update_recipe_module(repos['a'], 'mod', {'foo': []})
+    self.update_recipe(repos['a'], 'a_recipe', ['mod'], [('mod', 'foo')])
+    subprocess.check_output([
+        sys.executable, self._recipe_tool,
+        'remote_run',
+        '--repository', repos['a']['root'],
+        '--',
+        'a_recipe',
+    ], stderr=subprocess.STDOUT)
+
+
+if __name__ == '__main__':
+  sys.exit(unittest.main())