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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>