Adds bot_update to depot_tools.

infra/recipe_modules/bot_update/__init__.py

Index: infra/recipe_modules/bot_update/__init__.py
diff --git a/infra/recipe_modules/bot_update/__init__.py b/infra/recipe_modules/bot_update/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..66ddab8bcc317f5178a57e6f651c45a38892e78e
--- /dev/null
+++ b/infra/recipe_modules/bot_update/__init__.py
@@ -0,0 +1,27 @@
+from recipe_engine.recipe_api import Property
+
+DEPS = [
+  'gclient',
+  'recipe_engine/json',
+  'recipe_engine/path',
+  'recipe_engine/platform',
+  'recipe_engine/properties',
+  'recipe_engine/python',
+  'recipe_engine/raw_io',
+  'rietveld',
+  'recipe_engine/step',
+]
+
+PROPERTIES = {
+  'deps_revision_overrides': Property(default={}),
+  'event_patchSet_ref': Property(param_name="event_patchSet_ref", default=None),
+  'issue': Property(default=None),
+  'fail_patch': Property(default=False),
+  'failure_type': Property(default=None),
+  'parent_got_revision': Property(default=None),
+  'patchset': Property(default=None),
+  'patch_url': Property(default=None),
+  'rietveld': Property(default=None),
+  'repository': Property(default=None),
+  'revision': Property(default=None),
+}