Bug 1051172: a willhide event hack so the camera can stop recording quicker when home button pressed

Crossed comments with you. I understand if there's nothing we can do, but making the phone less responsive sucks.

Do you think opting into this behavior is difficult to add? E.g., the camera could message the system app through some terrible hack (IAC or settings), to implement this behavior. I'm not sure if taking this hit to go home is a good idea, but also signaling to only do it when recording seems like another hack on top of this.