set StreetViewControl

I’d like to set StreedViewControl in GoogleMap.

I saw below topic:
https://wordpress.org/support/topic/how-to-enable-street-view-option?replies=2

but can’t find the ‘Google v3 specific code’.
I created custom-googlev3.js already and what should I add to it?

https://wordpress.org/plugins/geo-mashup/