Make all SkSurface_* -related devices all have a device

Make all SkSurface_* -related devices all have a device

Make all devices created out of an initial SkSurface_{Gpu,Raster}
surface have a surface of their own.

This works towards a scenario whree all devices would have a surface.
This would enable Skia to use the SkImage snapshot facility of
SkSurface.

WIP: does not work yet.

BUG=skia:3388