prow/pubsub/subscriber/server.go
func (c *pubSubClient) subscription(id string) subscriptionInterface {
	return &pubSubSubscription{
		sub: c.client.Subscription(id),
	}
}
func (c *pubSubClient) subscription(id string) subscriptionInterface {
	return &pubSubSubscription{
		sub: c.client.Subscription(id),
	}
}
// Subscription creates a subscription from the Cloud Pub/Sub Client