google.golang.org/grpc/balancer/pickfirst.pickfirstBalancer.UpdateSubConnState (method, view implemented interface methods)

one use

	google.golang.org/grpc/balancer/pickfirst (current package)
		pickfirst.go#L210: func (b *pickfirstBalancer) UpdateSubConnState(subConn balancer.SubConn, state balancer.SubConnState) {