Prevent PiP movement while the resize animation is running.

- This was causing numerous artifacts when the user starts touching while
  transitioning into PiP where the move rects clobber the animating rect.

Bug: 35764922
Test: Try touching the PiP while it is entering or exiting PiP
Change-Id: I5a72b5bea694b01aab401d2bb78a493688a9c655
10 files changed