Re: [w3c/screen-orientation] Promise for unlock()? (#104)

> Can you reference source material regarding how underlying OS APIs report the success or failure of these requests? I'm a novice in this space and I don't see anything quite so obvious.

I'm not sure about the it works on Android... but quick search says one simply sets `requestedOrientation` on an Activity and then you can check if `onConfigurationChanged` was called. That doesn't exactly tell you if it failed though. 🤔 We might need to ask someone who knows Android well. 

On Apple's platform, one can monitor for changes also in a similar manner via [`UIDeviceOrientationDidChangeNotification`](https://developer.apple.com/documentation/uikit/uideviceorientationdidchangenotification). 

There is also [`requestGeometryUpdate(_:errorHandler:)`](https://developer.apple.com/documentation/uikit/uiwindowscene/3975944-requestgeometryupdate), which, as you can see, literally has the error handler as the callback. For the success case, one would rely on the change notification, should dispatch after a successful change. 

 

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