Disable gesture nav while PiP anim is running

This is a re-land of ag/28058564

To prevent the Recents transition that may conflict with PiP

Flag: EXEMPT bug fix
Bug: 340724371
Test: Swipe to show TaskBar while expanding PiP to FS mode
Change-Id: I8395f40bf64bc69af0e3c39789f3a727b03fae0d