Instead of calling validation functions directly in
PipelineLayoutBase::CreateDefault, use ValidateBGLDesc and
ValidatePipelineLayoutDesc.
Also makes the visibility of the default layout match the aggregation as
in the WebGPU spec.
Also makes refcounting of BGLs a bit less manual at the bottom of
CreateDefault.
Also adds tests for minBufferBindingSize and visiblity aggregation in
the default layout computations.
Bug: dawn:527
Change-Id: I6bbd5f3de8b235dddf6cbd2bedfd34a094fcb277
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28560
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>