tryserver recipe_module: Add get_tags.

recipe_modules/depot_tools/example.py

+# 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.
+
+DEPS = [
+  'depot_tools',
+  'recipe_engine/step',
+  'recipe_engine/path',
+  'recipe_engine/platform',
+]
+
+
+def RunSteps(api):
+  api.step(
+      'download_from_google_storage',
+      ['ls', api.depot_tools.download_from_google_storage_path])
+
+  api.step('cros', ['ls', api.depot_tools.cros_path])
+
+  api.step(
+      'gn_py_path', ['ls', api.depot_tools.gn_py_path])
+
+  api.step(
+      'gsutil_py_path', ['ls', api.depot_tools.gsutil_py_path])
+
+  api.step(
+      'ninja_path', ['ls', api.depot_tools.ninja_path])
+
+
+
+def GenTests(api):
+  yield api.test('basic')
+
+  yield api.test('win') + api.platform('win', 32)