Ensures display rotation triggers PiP re-position

Fixed in this CL, upon rotation change
- Updates display bounds in PipTaskOrganizer
- Issues PiP offset from PipTouchHandler (-> PipMotionHelper)

Bug: 150300422
Bug: 150275283
Test: manually rotating screen
Change-Id: I4262df6ddc306732693150f27ca0da6e294df5ab