This reverts commit 87171e73397f7edfd4c145fbaebdd7208954debf.
Internal performance test shows that this PR negatively affects startup time. I'll reland this PR in parts.
b/307872797
[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
Flow is a simple compositor based on Skia that the Flutter engine uses to cache
recorded paint commands and pixels generated from those recordings. Flow runs on
the raster thread and uploads information to Skia.