Right now, platform view layers are being recorded to a picture and then drawn to the background canvas: https://github.com/flutter/engine/blob/7ec7f3ca844f6931e1fbd43dade197e60c66fa48/shell/platform/darwin/ios/framework/Source/FlutterPlatformViews.mm#L546
These SkPictures are recorded as drawPicture ops, which Impeller has no way to render.

This will require RTree support in DisplayList.

Umbrella bug: #85737