
This PR changes the value of the `COEP` response header from `require-corp` to `credentialless` in the Flutter tool, when running `flutter run`/`drive` for Web projects. This enables running tests compiled to wasm, that access 3P resources (like Google Maps) without blocking those resources. Docs: * https://developer.chrome.com/blog/coep-credentialless-origin-trial#credentialless_to_the_rescue ## Issue * https://github.com/flutter/flutter/issues/152411