Kill floating activities running in the same thread when tapping outside
This change makes all activities from the same app to be finished when we tap outside the halo window. Other apps running in different threads
(floating or not) won't be finished.

Change-Id: I3c51eafdcee7032fa90876411da3ff1eae0106c3

Conflicts:
	policy/src/com/android/internal/policy/impl/PhoneWindow.java