This seperates the undefined 'arrayLayerCount' from 0 to
WGPU_ARRAY_LAYER_COUNT_UNDEFINED. So 0 arrayLayerCount is treated
as a validation error.
Bug: dawn:1026
Change-Id: I7b4ae024b02ac0d2aa260b2a8c64b09bd967db87
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/63660
Reviewed-by: Jie A Chen <jie.a.chen@intel.com>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Jie A Chen <jie.a.chen@intel.com>