Add Paths as first-class types in configs.

scripts/slave/recipe_modules/json/api.py

Index: scripts/slave/recipe_modules/json/api.py
diff --git a/scripts/slave/recipe_modules/json/api.py b/scripts/slave/recipe_modules/json/api.py
index e891d4b6a4c035a03c7074d36bedf3c4724c8f7e..f177d57d27bf80aed2c1799ff2b26e721d4016b7 100644
--- a/scripts/slave/recipe_modules/json/api.py
+++ b/scripts/slave/recipe_modules/json/api.py
@@ -10,6 +10,7 @@ from cStringIO import StringIO
 
 from slave import recipe_api
 from slave import recipe_util
+from slave import recipe_config_types
 
 from .util import TestResults
 
@@ -85,6 +86,7 @@ class JsonApi(recipe_api.RecipeApi):
     @functools.wraps(json.dumps)
     def dumps(*args, **kwargs):
       kwargs['sort_keys'] = True
+      kwargs.setdefault('default', recipe_config_types.json_fixup)
       return json.dumps(*args, **kwargs)
     self.dumps = dumps