Reland "Move runtime shader/colorfilter into SkRuntimeEffect.cpp"

This reverts commit 7281a8623799021d47ebcdb5d0efa6d200cca1cd.

Change-Id: I1759358ede39e2466362cc4d3f0b9530eff08c9e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/271656
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
7 files changed