depot_tools: add presubmit recipe module

recipe_modules/presubmit/example.py

Index: recipe_modules/presubmit/example.py
diff --git a/git-hyper-blame b/recipe_modules/presubmit/example.py
old mode 100755
new mode 100644
similarity index 59%
copy from git-hyper-blame
copy to recipe_modules/presubmit/example.py
index 4abb969a88c3addb8a050e7c6442c5842c2c3150..1253519a38a666d9b9aac2d82b6a352651ea5835
--- a/git-hyper-blame
+++ b/recipe_modules/presubmit/example.py
@@ -1,6 +1,15 @@
-#!/usr/bin/env bash
 # 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.
 
-. $(type -P python_runner.sh)
+DEPS = [
+  'presubmit',
+]
+
+
+def RunSteps(api):
+  api.presubmit()
+
+
+def GenTests(api):
+  yield api.test('basic')