Make GrGpu pixel ops functions take SkIRect instead of LTRB params.

Change-Id: Ic4a8a32a434485b84284decbcc5a8f898197169a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/408359
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
23 files changed