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feat: add support for WebUSB (#36289)

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* feat: add support for WebUSB

* fixup for gn check

* fixup gn check on Windows

* Apply review feedback

Co-authored-by: Charles Kerr <charles@charleskerr.com>

* chore: address review feedback

* chore: removed unneeded code

* Migrate non-default ScopedObservation<> instantiations to ScopedObservationTraits<> in chrome/browser/

4016595

Co-authored-by: Charles Kerr <charles@charleskerr.com>
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38
docs/tutorial/devices.md
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@ -115,3 +115,41 @@ when the `Test Web Serial` button is clicked.
```javascript fiddle='docs/fiddles/features/web-serial'
```
## WebUSB API
The [WebUSB API](https://web.dev/usb/) can be used to access USB devices.
Electron provides several APIs for working with the WebUSB API:
* The [`select-usb-device` event on the Session](../api/session.md#event-select-usb-device)
can be used to select a USB device when a call to
`navigator.usb.requestDevice` is made. Additionally the [`usb-device-added`](../api/session.md#event-usb-device-added)
and [`usb-device-removed`](../api/session.md#event-usb-device-removed) events
on the Session can be used to handle devices being plugged in or unplugged
when handling the `select-usb-device` event.
**Note:** These two events only fire until the callback from `select-usb-device`
is called. They are not intended to be used as a generic usb device listener.
* The [`usb-device-revoked' event on the Session](../api/session.md#event-usb-device-revoked) can
be used to respond when [device.forget()](https://developer.chrome.com/articles/usb/#revoke-access)
is called on a USB device.
* [`ses.setDevicePermissionHandler(handler)`](../api/session.md#sessetdevicepermissionhandlerhandler)
can be used to provide default permissioning to devices without first calling
for permission to devices via `navigator.usb.requestDevice`. Additionally,
the default behavior of Electron is to store granted device permission through
the lifetime of the corresponding WebContents. If longer term storage is
needed, a developer can store granted device permissions (eg when handling
the `select-usb-device` event) and then read from that storage with
`setDevicePermissionHandler`.
* [`ses.setPermissionCheckHandler(handler)`](../api/session.md#sessetpermissioncheckhandlerhandler)
can be used to disable USB access for specific origins.
### Example
This example demonstrates an Electron application that automatically selects
USB devices (if they are attached) through [`ses.setDevicePermissionHandler(handler)`](../api/session.md#sessetdevicepermissionhandlerhandler)
and through [`select-usb-device` event on the Session](../api/session.md#event-select-usb-device)
when the `Test WebUSB` button is clicked.
```javascript fiddle='docs/fiddles/features/web-usb'
```