fix(googlemaps): add missing properties
fix(googlemaps): add missing properties

should fix #642

ramonornela/ionic-native,xueron/ionic-native,driftyco/ionic-native,xueron/ionic-native,klirix/ionic-native,klirix/ionic-native,ramonornela/ionic-native,ramonornela/ionic-native,klirix/ionic-native,driftyco/ionic-native,ramonornela/ionic-native,xueron/ionic-native,driftyco/ionic-native,xueron/ionic-native