[skif] FilterResult::Builder can bind FilterResults to sksl shaders

Updates SkRuntimeImageFilter to use FilterResults and the new SkSL
builder.

Change-Id: Ia6ff03efbfe21c2c22d687fbc555fe72c777c36f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/697556
Auto-Submit: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
9 files changed