[geolocation-api] Add support for converting GeolocationCoordinates to JSON (object) (#145)

marcoscaceres has just created a new issue for https://github.com/w3c/geolocation-api:

== Add support for converting GeolocationCoordinates to JSON (object) ==
Given `GeolocationCoordinates` are just nullable doubles, it would be nice if GeolocationCoordinates exposed a (WebIDL) default `.toJSON()` method. 

Please view or discuss this issue at https://github.com/w3c/geolocation-api/issues/145 using your GitHub account


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