Adds bot_update to depot_tools.

infra/recipe_modules/rietveld/example.py

Index: infra/recipe_modules/rietveld/example.py
diff --git a/infra/recipe_modules/rietveld/example.py b/infra/recipe_modules/rietveld/example.py
new file mode 100644
index 0000000000000000000000000000000000000000..f938fc1afce318d00eaff348819a559a38a74bc1
--- /dev/null
+++ b/infra/recipe_modules/rietveld/example.py
@@ -0,0 +1,16 @@
+# Copyright 2014 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.
+
+DEPS = [
+  'recipe_engine/path',
+  'rietveld',
+]
+
+def RunSteps(api):
+  api.path['checkout'] = api.path['slave_build']
+  api.rietveld.calculate_issue_root({'project': ['']})
+
+
+def GenTests(api):
+  yield api.test('basic')