Fullscreen window

[andrewnicols]

I've included an extra commit here because the W3C mode doesn't take any arguments but JSONWire does but we were still including the args still.

[andrewnicols]

I think that this should be ready to land. I've had to exclude edge for now because SauceLabs seems to be running an old version (their docs suggest EdgeHTML 18) which does not support the fullscreen command.

Microsoft are now releasing Edge based on Blink so we should be able to remove this exclusion when SauceLabs bump their edge versions.

[andrewnicols]

Thanks,

That makes total sense. I've changed it to throw an exception and have modified the test to skip for the JsonWire protocol.

[OndraM]

Thanks @andrewnicols!