This is causing the benchmark to not render with Skia. We probably need to CHECK this somewhere in the backend..

Now that `platformViewRegistry` is [exposed](https://github.com/flutter/engine/pull/41877) through `dart:ui_web`, we can do some cleanup here.

Part of https://github.com/flutter/flutter/issues/126831

Add a benchmark that measures the improvements from https://github.com/flutter/engine/pull/41803