Jake Gyllenhaal screened his buzzed-about upcoming movie “End of Watch” for Jay-Z at the Crosby Street Hotel on Wednesday. The rapper attended Gyllenhaal’s small friends-and-family screening of the Open Road Films movie, which comes out Sept. 28 as directed by “Training Day” writer David Ayer. Sources said Jay could be contributing a song to the project, which stars Gyllenhaal and Michael Pena as LAPD officers, with Anna Kendrick and America Ferrera. Producer John Lesher was also a guest. His next movie, “Blood Ties,” is shooting here with Clive Owen, Billy Crudup, Mila Kunis, Zoe Saldana, James Caan and Marion Cotillard.