Make it easier to support use of RGBA_101012 rather than RGBA_8888 for EGL
contexts, displays, and surfaces.
This tangentially supports adding HDR tests, by slightly simplifying the color
selection logic we'd have to add in HDR tests.
PiperOrigin-RevId: 482219428
(cherry picked from commit bb215857e5fd0768ce53c7c61ba91c48dab14bd2)