Merge "Maintain Z order for all layers in offscreen hierarchy" into rvc-dev...

Merge "Maintain Z order for all layers in offscreen hierarchy" into rvc-dev am: 7e5f235d am: a484edb5 am: 4fd0779e am: 9b6c764e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/11791944

Change-Id: I185a26bc9d77f6267580d40c4e1efe03591c4ec0