depot_tools: add infra_paths recipe module for infra-specific paths

recipe_modules/infra_paths/example.py

Index: recipe_modules/infra_paths/example.py
diff --git a/recipe_modules/infra_paths/example.py b/recipe_modules/infra_paths/example.py
new file mode 100644
index 0000000000000000000000000000000000000000..9e6f712faa03f8329cc67480364f801ab30b18bd
--- /dev/null
+++ b/recipe_modules/infra_paths/example.py
@@ -0,0 +1,24 @@
+# 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 = [
+  'infra_paths',
+  'recipe_engine/platform',
+  'recipe_engine/properties',
+  'recipe_engine/step',
+]
+
+from recipe_engine.config_types import Path
+
+def RunSteps(api):
+  api.step('step', [], cwd=api.infra_paths['slave_build'])
+
+
+def GenTests(api):
+  for platform in ('linux', 'win', 'mac'):
+    yield (api.test(platform) + api.platform.name(platform))
+
+    yield (api.test('%s_kitchen' % platform) +
+           api.platform.name(platform) +
+           api.properties(path_config='kitchen'))