Initial changes to support expanded PiP

- Prior to this CL, the input consumer and size of the PiP was tightly
  coupled with the visibility of the menu, but with the expanded state,
  the PiP should still move while the menu is visible.

Bug: 35358488
Test: Click on the PiP to expand it

Change-Id: If52208f19af516b2455bde26855c80f44bc9021a