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This makes previously broken ref tests on Win crash the
GPU process instead, though the tests still render to the canvas
correctly when run.

This same crash already exists on Linux before this patch, but the
crash isn't reported by the harness.

This is likely a pre-existing issue in Chrome
where Dawn SharedImages don't work with the screenshots. In
general, canvas readback for WebGPU is currently unimplemented.

Bug: 976495, 1083478
Change-Id: I345151bd6ce38fc00e52c1efd12bddb8a425e283
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438893
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813870}