Add RP codegen support for uniforms.

Change-Id: I61c471b907aaf9aae2bcc432443e49f397610b74
Bug: skia:13676
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/620228
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
2 files changed