window.create() not available to extensions

[Isaac Cambron]

Is your feature request related to a problem? Please describe.
I have a complex extension that needs to be able to open windows. But the web socket doesn't accept "window.create"

Describe the solution you'd like
Add window.create to the router

Describe alternatives you've considered
I can in theory do this by broadcasting a message and having an existing window listen for that and call the JS method. But this is awkward, and requires a specific window to know it's the one responsible for doing the opening.