43f4c1d3c7fe3cb9ceb3e64d02e40b4bff396b0d
For https://github.com/flutter/flutter/issues/33807 We still need to make layers' children immutable for full immutability. That will require us to change the SceneBuilder API to build the layer bottom up instead of top down (post-order traversal instead of pre-order traversal).
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