Fixing issue with double tapping PiP.

- If a user taps the PiP quickly multiple times, you can hit a case where
  you expand the PIP, which triggers the re-registration of the
  InputConsumer, but doesn't disable touches until the pinned stack
  animation starts.  If the user taps in between that time, it can trigger
  a resizing of the stack what aborts the expand animation
- Also adding additional debugging logs

Bug: 37657050
Test: Quickly tap the PiP

Change-Id: Ib0088a3aa8e917aca3214c289a0787bdf7e66199