Add git_cl recipe module.

recipe_modules/git_cl/config.py

Index: recipe_modules/git_cl/config.py
diff --git a/recipe_modules/git_cl/config.py b/recipe_modules/git_cl/config.py
new file mode 100644
index 0000000000000000000000000000000000000000..70a96e7e20f91b643d6132bea28355a1fd5885c8
--- /dev/null
+++ b/recipe_modules/git_cl/config.py
@@ -0,0 +1,22 @@
+# Copyright 2013 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 types
+
+from recipe_engine.config import config_item_context, ConfigGroup, BadConf
+from recipe_engine.config import Single
+from recipe_engine.config_types import Path
+
+def BaseConfig(**_kwargs):
+  return ConfigGroup(
+    repo_location=Single(Path)
+  )
+
+config_ctx = config_item_context(BaseConfig)
+
+@config_ctx()
+def basic(c):
+  pass
+
+