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Vance Ingalls
556fe936f8
Picks up crbug 522872457's fix (CL 8032671), which landed after the 152.0.7935.0 canary cut and so was absent from the old 152.0.7928.2 pin. Re-probed every 3D signal the compile gate matches, drawElementImage vs a CDP screenshot of the identical state, on the shipping headless-shell binary. PSNR, old pin -> new pin: backface-visibility:hidden 1.4 dB -> 14.8 dB still DAMAGED preserve-3d (no backface) 46.7 dB -> 46.7 dB clean perspective() 45.2 dB -> 45.2 dB clean matrix3d() 45.2 dB -> 45.2 dB clean rotate3d() 45.3 dB -> 45.3 dB clean translateZ under perspective 29.9 dB -> 29.9 dB marginal The upstream fix repaired the collateral damage only: dropped sibling content and lost backgrounds now render, but a culled backface is still painted. So the 3D gate stays. Beta rather than Canary because 153.0.8000.0 measured identical on every variant. Follow-up filed as PRINFRA-486: four of the five signals the gate matches were never broken on any build tested, so it may be able to narrow to backface-visibility alone. Needs a corpus eval first — this probe covers static angles only, and animated 3D subtrees take a different path.