Update bound as user moves PIP, and reuse it for snapAlgorithm reentry.

Update PipTaskOrganizer's last reported bounds as user moves the PIP
around. We then use this bound to calculate the snap fraction, and then
restore it on display rotation.

Bug: 147155783
Test: Start PIP, move PIP to different corner, rotate - same corner.
Change-Id: Ieb7054d9b66557aae63260767689d6523d87cdca