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Layers were a feature of the legacy drawing path. If we re-add them at
some point, it probably makes more sense to make them a product of
display list inspection.
This change also remove a bunch of dead painting code.
Source-Repo: https://github.com/servo/servo
Source-Revision: bb271ef4afea02b6b1b5d207e773d1fedccd2906
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- [x] These changes fix#12763 (github issue number if applicable).
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Source-Repo: https://github.com/servo/servo
Source-Revision: 9b4b94aa755a04d4b9c9703574b01c03ad25a788