Add explicit --cross-origin-isolation flag to flutter run.
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This pull request introduces a new --cross-origin-isolation flag to flutter run, drive, and test commands. This allows developers to explicitly enable or disable Cross-Origin Opener Policy (COOP) and Cross-Origin Embedder Policy (COEP) headers on the web server. The default behavior is to enable these headers when wasm is used and disable them otherwise. The changes are well-implemented across the tool, including command-line parsing, debugging options, and the web asset server. I have one minor suggestion for code consistency.
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Looks good, thanks for addressing this!
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Fixes #163479
This adds a flag,
--cross-origin-isolation/--no-cross-origin-isolationthat allows the user to explicitly control whetherflutter run/drive/testserves files with COOP/COEP headers. If the user doesn't specify, it uses cross origin isolation when wasm is enabled and no cross origin isolation when wasm is disabled.