Track PictureInPictureParams in PipTaskOrganizer

When onTaskInfoChanged is invoked, always compare it with the last known
PictureInPictureParams and keep PipBoundsHandler in sync w/ the latest

Bug: 155004450
Test: tap next vidoe in YouTube PiP window
Change-Id: Ia88f96c7d88f973369759b27472931fa35e7641a