def _construct_operation_id(self, service_name, protorpc_method_name):
<EOL>method_name_camel = util.snake_case_to_headless_camel_case(<EOL>protorpc_method_name)<EOL>return '<STR_LIT>'.format(service_name, method_name_camel)<EOL>
Return an operation id for a service method.

        Args:
          service_name: The name of the service.
          protorpc_method_name: The ProtoRPC method name.

        Returns:
          A string representing the operation id.