Add saturate to list of supported WGSL intrinsics.

Saturate is one of the common intrinsics that we always export from
runtime effects, so it's worth including it explicitly from our list
of WGSL supported intrinsics. From a functionality perspective, this
CL is a no-op; we were already handling this intrinsic via the
switch's `default` case-handler. This was just a missing case that I
noticed while cross-checking the list of supported WGSL intrinsics.

Change-Id: I671ba5a803532abe3996f47d21a8a143893727a4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/763376
Commit-Queue: Nicolette Prevost <nicolettep@google.com>
Reviewed-by: Nicolette Prevost <nicolettep@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
1 file changed