Add missing `degrees` function to SkSL intrinsics.

Change-Id: I4a443793d5f0fb6dac4abef07ed2ea33fff3a14a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/341721
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2 files changed