Add @requires_webgpu, make WebGPU tests fail if unavailable #21870
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This makes these tests safer so they won't just silently pass if you happen to run against a browser/system where WebGPU isn't available (currently including Chrome on Linux and Firefox/Safari).
Verified these 6 tests fail without WebGPU support, using:
EMTEST_BROWSER='/Applications/Google\ Chrome\ Canary.app/Contents/MacOS/Google\ Chrome\ Canary --disable-gpu' test/runner.py 'browser.test_webgpu*'
And that they're skipped when prepending
EMTEST_LACKS_WEBGPU=1
to that.(
--disable-gpu
has the side effect of disabling WebGPU since we don't ship a software fallback in Chrome right now.)