A new PSA has been shared for Chris Cornell’s The Promise Campaign, and it features the late Soundgarden, etc. frontman, as well as his kids, and other celebraties including: Christian Bale, Oscar Isaac, George Clooney, Josh Brolin, Jennifer Lopez, Tom Hanks, Elton John, Snoop Dogg, Serj Tankian, Ozzy Osbourne, Tom Morello and Matt Cameron. The…