depot_tools: expose path to download_from_google_storage

recipe_modules/depot_tools/api.py

Index: recipe_modules/depot_tools/api.py
diff --git a/recipe_modules/depot_tools/api.py b/recipe_modules/depot_tools/api.py
new file mode 100644
index 0000000000000000000000000000000000000000..97eec12dd30e6ea6e213536de591b2aafe305d33
--- /dev/null
+++ b/recipe_modules/depot_tools/api.py
@@ -0,0 +1,10 @@
+# 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.
+
+from recipe_engine import recipe_api
+
+class DepotToolsApi(recipe_api.RecipeApi):
+  @property
+  def download_from_google_storage_path(self):
+    return self.package_resource('download_from_google_storage.py')