This patch implements the inter-stage variable matching rules on
the interpolation attributes ('interpolation type' and
'interpolation sampling'). WebGPU SPEC requires that the interpolation
attributes must match between vertex outputs and fragment inputs with
the same location assignment within the same pipeline.
BUG=dawn:802
TEST=dawn_unittests
Change-Id: Ied38d68f73868c30b0392954683963a801e3f3aa
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/60160
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>