Scaling PiP proportionally on screen rotation and fold/unfold

The end bounds are stored in PipBoundsState and the transition system
does not have knowledge of the proportional resize, so the value in
pipChange.getEndAbsBounds() is not the correct one.

Updating the rotation handler to correctly update the scale and max
size in OnDisplayChangingListener, so that all future calculations
are using the updated values for scale/max size.

Since the value has been cached locally in PipBoundsState, having
stale invocations would lead to artifacts such as PiP resizing in
unexpected way upon screen rotation or during fixed rotation enter
PiP animation.

Test: manually
Test: atest EnterPipToOtherOrientation
Test: 3 button nav rotation http://recall/-/ekEuGtt9d9HWqkUtAzpHx8/gxlk5IJSb0gVojnPfJvMxY
Test: gesture nav rotation http://recall/-/ekEuGtt9d9HWqkUtAzpHx8/ga3gIHEOVatMVTr6WXQnNX
Test: 3 button nav fixed rotation enter pip http://recall/-/ekEuGtt9d9HWqkUtAzpHx8/8A94b9HbYXvtlEuU8KQO5
Test: gesture nav fixed rotation enter pip http://recall/-/ekEuGtt9d9HWqkUtAzpHx8/gcJsqm3Hu3RaYagOapDXsS
Bug: 322091225
Bug: 319083003
Bug: 308093519
Bug: 323789757
Flag: none

Change-Id: Idc1429577da5c1817fe2f4ad12cefc32e0e86dd6