Revert "Revert "remove 'in uniform' support from GrSkSLFP, make rules more clear""

This reverts commit 85705c1b3bc53d887fddec1912e9c155044a5b2a.

Change-Id: If189dafce53491728296a4292c76af55b05835ac
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/244509
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
11 files changed