Re: [ServiceWorker] Invoke the has focus steps instead of hasFocus() method directly. Fixes #633. (3d0ee14)

Resolving it is sort of okay. But with non-primitive values it becomes broken. Not immediately sure what a better way to specify this would be. But assume you need to write the JavaScript code that creates all these objects and you can only use postMessage() to cross threads. That kind of gives you an idea as to what the constraints are.

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