'Implements interface.'

def add_files_to_upload(self, options, file_set):

    if options.appengine_account_credentials:
        file_set.add(options.appengine_account_credentials)
    if options.appengine_account_git_https_credentials:
        file_set.add(options.appengine_account_git_https_credentials)
    if options.appengine_account_git_oauth_credentials:
        file_set.add(options.appengine_account_git_oauth_credentials)
    if options.appengine_account_ssh_private_key_passphrase:
        file_set.add(options.appengine_account_ssh_private_key_passphrase)
