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test: use Worker scope in WPT

test: use Worker scope in WPT

Previously, we use the Window scope by default in our WPT test runner. When one of the test fails, the WPT harness would try to use document.getElementsByTagName() etc. to display the failure, which is not going to work for us.

This patch switches the scope to DedicatedWorker and use our Worker implementation as a global - this does not test the Worker implementation per se, just tells the WPT harness to pass the results back to us via the callbacks we installed and not try to access a document.

We may still need to use a Window scope when we try to run .window.js tests in the future, but for now we only run .any.js tests so it's fine to use a worker scope by default.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

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