Use appBounds for source bounds if provided

App bounds should be used when calculating the
adjusted source-rect-hint when app doesn't provide
their own, as overlays attached take up the full app bounds
despite the display cutouts present.

The app bounds are also used for adjusted source rect hint calculation
on the Launcher side, so this helps avoid a mismatch in crops.

Bug: 352773027
Flag: EXEMPT bugfix
Test: swipe PiP to home from Maps with fixed rotation (90 and 270)
Change-Id: Ie7259136a1c65ebc0085292fa4a5f9b46b5ec2a7