2db3d26f4a180a52d1607f4426bafaa808c0ccaa
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.
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