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This essentially reverts https://github.com/flutter/engine/pull/4197/ as no one is (or soon will be) implementing an alternative LayerBuilder. Let's just put everything in SceneBuilder to reduce the YAGNI (you aren't gonna need it) smell. This will also make retained rendering API changes much easier.
Flow
Flow is a simple compositor based on Skia that the Flutter engine uses to cache recoded paint commands and pixels generated from those recordings. Flow runs on the GPU thread and uploads information to the GPU.