Update GrRRectEffect to take an input FP and return a MakeResult.

Change-Id: If5abcd2347871c62e03c8708705ec1041572465a
Bug: skia:10217
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/296838
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
6 files changed