Reland "Preserve pixel config in makeColorSpace of GPU backed images"

Adding 8888 fallback for F16 pixel config to fix cc unit test failures.

Bug: skia:
Change-Id: I22d5442f4831e95a54fe3fff63afb49a5e639d8f
Reviewed-on: https://skia-review.googlesource.com/c/162542
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed