HALO: 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: Ib377579ae5dc3b9f7e4c95129d6d353d2ba4b65f
Merge remote-tracking branch 'upstrea/jb-mr1_mkt' into jb-mr1_mkt