UpdateExtensionStatistics.
        [Preview API]
        :param :class:`<ExtensionStatisticUpdate> <azure.devops.v5_0.gallery.models.ExtensionStatisticUpdate>` extension_statistics_update:
        :param str publisher_name:
        :param str extension_name:

def update_extension_statistics(self, extension_statistics_update, publisher_name, extension_name):
        """UpdateExtensionStatistics.
        [Preview API]
        :param :class:`<ExtensionStatisticUpdate> <azure.devops.v5_0.gallery.models.ExtensionStatisticUpdate>` extension_statistics_update:
        :param str publisher_name:
        :param str extension_name:
        """
        route_values = {}
        if publisher_name is not None:
            route_values['publisherName'] = self._serialize.url('publisher_name', publisher_name, 'str')
        if extension_name is not None:
            route_values['extensionName'] = self._serialize.url('extension_name', extension_name, 'str')
        content = self._serialize.body(extension_statistics_update, 'ExtensionStatisticUpdate')
        self._send(http_method='PATCH',
                   location_id='a0ea3204-11e9-422d-a9ca-45851cc41400',
                   version='5.0-preview.1',
                   route_values=route_values,
                   content=content)