[graphite] Take two at fixing non-Metal build

Bug: skia:12466
Change-Id: I7eb240985ce0c267bbc7be040e0f812407d31435
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/461699
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
Auto-Submit: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
2 files changed