We're very interested to see this happen as it would enable us to use WebUSB for the Hangouts Meet speakermic to use together with a Hotrod / CfM running in kiosk mode. We would prefer #1 to be similar to chrome.usb in the sense of being able to whitelist devices without requiring a user prompt

Any update on this? It seems navigator.usb is exposed in the chrome app, but I can't test any further because the device picker does not show up. 

I recently investigated #2 above and we will indeed need special code in order to create a permission prompt on top of a Chrome App/Extension window.

Is there a branch with the current dev-status?

Any suggestions of how to speed this up? (e.g. specific research, assistance or possibly some incentive like a bounty) ?

(sidenote: agreeing with comment 2: white-list preferred)

 Issue 875861  has been merged into this issue.

What are the difficulties in exposing this for extension tabs?  It seems like then, there should be very little custom code required.  (I agree there are UX challenges with exposing this for background pages, popups, etc.)

I'd like to see if we can separate this out, and not block exposing this to extensions (which have fewer complications) on figuring out how it should work with Chrome Apps.

To do this only for extension pages hosted in tabs all we have to answer is how to word the request in the permission prompt as showing the chrome-extension://... URL is not going to be meaningful to the user. Do we have an existing example of those for other permissions? For chrome.usb.getUserSelectedDevices() we use the name of the Chrome App.

Could we show the extension name?  That's what we normally do in these cases, and is also what the site chip shows.

Attached is an example for an extension using navigator.geolocation.

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We have to stick with the "deprecating" Chrome App instead of preferred "extension" before this fixed.

web bluetooth device selection works fine. what is blocking webusb device selection popup?

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It just needs to be implemented and tested.

any pointers for where to start implementation? I have c++ experience.