Fix webkitpy scm_unittests so that they pass again.

Tools/Scripts/webkitpy/common/checkout/scm/scm.py

 # Copyright (c) 2009, Google Inc. All rights reserved.
 # Copyright (c) 2009 Apple Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 68 matching lines @@
     def _subclass_must_implement():
         raise NotImplementedError("subclasses must implement")
 
     @classmethod
     def in_working_directory(cls, path, executive=None):
         SCM._subclass_must_implement()
 
     def find_checkout_root(self, path):
         SCM._subclass_must_implement()
 
-    def add(self, path, return_exit_code=False):
-        self.add_list([path], return_exit_code)
+    def add(self, path, return_exit_code=False, recurse=True):
+        self.add_list([path], return_exit_code, recurse)
 
-    def add_list(self, paths, return_exit_code=False):
+    def add_list(self, paths, return_exit_code=False, recurse=True):
         self._subclass_must_implement()
 
     def delete(self, path):
         self.delete_list([path])
 
     def delete_list(self, paths):
         self._subclass_must_implement()
 
     def move(self, origin, destination):
         self._subclass_must_implement()
@@ skipping 32 matching lines @@
     #--------------------------------------------------------------------------
     # Subclasses must indicate if they support local commits,
     # but the SCM baseclass will only call local_commits methods when this is true.
     @staticmethod
     def supports_local_commits():
         SCM._subclass_must_implement()
 
     def commit_locally_with_message(self, message, commit_all_working_directory_changes=True):
         _log.error("Your source control manager does not support local commits.")
         sys.exit(1)