Move uniforms, textures and samplers to the preamble section.

These need to be above any helper functions.

Change-Id: I6ed580b5be8822d720a9a649324699ee227578bd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/550709
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
1 file changed