Active Display: add isCallIncoming()
Prevent the proximity sensor from double-tapping when waking the device.
Reduce the threshold below which the phone is declared to be in a pocket.
KeyguardViewMediator: Play lock screen sound sooner

When the screen is locked, there is a long pause before the lock
sound actually plays.

This makes that sound happen much sooner.

Change-Id: Iede7a5d22291d1ada98800d2b380c255547df61d