'Sets the listing of the files we have processed. Most often this is used
with a newly created :class:`~stem.descriptor.reader.DescriptorReader` to
pre-populate the listing of descriptor files that we have seen.
:param dict processed_files: mapping of absolute paths (**str**) to unix
timestamps for the last modified time (**int**)'

def set_processed_files(self, processed_files):

    self._processed_files = dict(processed_files)
