Move verified color attachment flag to FormatInfo.

Bug: skia:6718
Change-Id: I7d44177bab44d8d72ded7442e1a17c5f451882a4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/228058
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
2 files changed