Public methods may only refer to public types in their signature. This
change ensures that by switching to a public supertype everywhere.
PiperOrigin-RevId: 485568625
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