Chromium-only Linux key codes

[madsmtm]

I went through Chromium's sources, and it seems like they have a variant that is not exposed in this library: KeyboardBacklightToggle

That said, I wonder if it makes sense to actually expose here? The docs explicitly say:

As with privacy screen, keyboard backlight toggle will not be exposed to web content.

But if that's the case, then perhaps we shouldn't have PrivacyScreenToggle and MicrophoneMuteToggle either?

[pyfisch]

I think the crate should have KeyboardBacklightToggle, as it may potentially be useful to someone who doesn't work with web content.