Add an AOSP builder recipe.

scripts/slave/unittests/recipes_test.py

Index: scripts/slave/unittests/recipes_test.py
diff --git a/scripts/slave/unittests/recipes_test.py b/scripts/slave/unittests/recipes_test.py
index f568ca2de6c0f1885904e86a5e4c41652580f129..1aacac8715645f6fc7df912849a10201f8168651 100755
--- a/scripts/slave/unittests/recipes_test.py
+++ b/scripts/slave/unittests/recipes_test.py
@@ -119,11 +119,12 @@ def execute_test_case(test_fn, recipe_path):
   bp = test_data.get('build_properties', {})
   fp = test_data.get('factory_properties', {})
   td = test_data.get('test_data', {})
+  pm = test_data.get('paths_to_mock', [])
   fp['recipe'] = os.path.basename(os.path.splitext(recipe_path)[0])
 
   stream = annotator.StructuredAnnotationStream(stream=open(os.devnull, 'w'))
   with cover():
-    with recipe_util.mock_paths():
+    with recipe_util.mock_paths(paths_to_mock=pm):
       step_data = annotated_run.run_steps(stream, bp, fp, td).steps_ran.values()
       return [s.step for s in step_data]