Add support for texture-sharpening sample bias in Metal.

Change-Id: I8fd2f8d2c6dfd092abfe156f4a0fb4dd45c26d9c
Bug: skia:13548
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/561837
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
1 file changed