Diane Warren and Lady Gaga are nominated for both an Oscar and a Grammy for their song “Til It Happens to You,” from the documentary “The Hunting Ground,” about sexual assault on campus. The duo lost the Grammy for best song written for visual to “Glory” (performed by Common ft. John Legend) from the film “Selma.” Variety editor Steve Chagollan talks to Warren about how the song was written, what it means to her and how Lady Gaga got involved.