recipe_autoroller: pass --rietveld to git cl set-commit to match upload

recipes/recipe_modules/recipe_autoroller/api.py

Index: recipes/recipe_modules/recipe_autoroller/api.py
diff --git a/recipes/recipe_modules/recipe_autoroller/api.py b/recipes/recipe_modules/recipe_autoroller/api.py
index af74590768dfd1be1ff6afbec9584aeb836e5d5e..c5f7d880cbb675bc1a662674691e6f045414d6d2 100644
--- a/recipes/recipe_modules/recipe_autoroller/api.py
+++ b/recipes/recipe_modules/recipe_autoroller/api.py
@@ -238,7 +238,8 @@ class RecipeAutorollerApi(recipe_api.RecipeApi):
       elif roll_result['trivial']:
         # We won't be uploading. Make sure trivial rolls don't get stuck
         # if previous CQ attempt failed because of flake.
-        self.m.git('cl', 'set-commit', cwd=workdir)
+        # Pass --rietveld flag to match upload args below.
+        self.m.git('cl', 'set-commit', '--rietveld', cwd=workdir)
 
     if need_to_upload:
       commit_message = (