Set up depot_tools as a recipe package, and add depot_tools recipe module.

tests/recipes_test.py

Index: tests/recipes_test.py
diff --git a/tests/recipes_test.py b/tests/recipes_test.py
new file mode 100755
index 0000000000000000000000000000000000000000..99b149d466086997ca70e7a7dfef643a10a2faa3
--- /dev/null
+++ b/tests/recipes_test.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2015 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.
+
+"""Runs simulation tests and lint on the recipes."""
+
+import os
+import subprocess
+
+ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+def recipes_py(*args):
+  subprocess.check_call([os.path.join(ROOT_DIR, 'recipes.py')] + list(args))
+
+recipes_py('simulation_test', '--threshold=92')
+recipes_py('lint')