Render a JSON policy resource.

        Overrides the base class version to convert :attr:`etag` from bytes
        to JSON-compatible base64-encoded text.

        Returns:
            dict: a JSON resource to be passed to the
            ``setIamPolicy`` REST API.

def to_api_repr(self):
        """Render a JSON policy resource.

        Overrides the base class version to convert :attr:`etag` from bytes
        to JSON-compatible base64-encoded text.

        Returns:
            dict: a JSON resource to be passed to the
            ``setIamPolicy`` REST API.
        """
        resource = super(Policy, self).to_api_repr()

        if self.etag is not None:
            resource["etag"] = base64.b64encode(self.etag).decode("ascii")

        return resource