Fix bug with makeColorSpace of GPU images with non-renderable configs

A few GMs that draw Gray8 images found this on the gbr-gl config.

Bug: skia:
Change-Id: Iadeb21717d4d1daa48b85e08c45b1d058c2fe1b7
Reviewed-on: https://skia-review.googlesource.com/c/162282
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed