Add support for SRGB formats when validating backend formats and ColorTypes

Bug: skia:
Change-Id: I4413e8e629528608d773d41c6a4a4306eff154c8
Reviewed-on: https://skia-review.googlesource.com/85045
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
2 files changed