Move SkRP extended program-ops into a dedicated macro.

Previously, these were repeated in a handful of places, which was
redundant and fragile.

Change-Id: I9dd0ccd6599992583e45c8c925c53a54036ff6b1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/661039
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
2 files changed