wkwebview with location services
In iOS 8, you need to have a key in your Info.plist that the system can use to prompt for location usage. In your case you want to add a key/value pair with key NSLocationWhenInUseUsageDescription. The value of that pair will be shown in the first popup, from the system, asking if your app can access location services. Then Google Maps will be allowed to pop up its own alert.