Supply device and local coords to SkShader_Base::onProgram

Use that to add support for sk_FragCoord in SkRuntimeEffect.

Change-Id: I587ad97057c13ec8a4052c7c20f655eae88786ba
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/298504
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
33 files changed