[graphite] Handle Dawn breaking change moving Compat limits to extension

Needed in order to update Dawn to match the standard webgpu.h, here:
https://dawn-review.googlesource.com/c/dawn/+/244294

Bug: chromium:416304914
Change-Id: I604765e87e303f9f91c329d3b0a240eca2a7880c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1000896
Reviewed-by: Nicolette Prevost <nicolettep@google.com>
Commit-Queue: Nicolette Prevost <nicolettep@google.com>
Auto-Submit: Kai Ninomiya <kainino@chromium.org>
1 file changed