[wasm-mt] Fix cross-origin headers when running the browser threads sample test #74342
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The work item
Wasm.Browser.Threads.Sample
fails when multi-threading is enabled with the following log output:This suggests that there is a problem with the
Cross-Origin-Opener-Policy
andCross-Origin-Embedder-Policy
headers (see MDN). We need to pass the--web-server-use-cop
option to xharness to resolve this problem.With this fix, the test succeeds: