addMarkers method
Implementation
@override
Future<void> addMarkers(Map<MarkerId, GeoPoint> markers) =>
_invokeVoid('addMarkers', 'android#marker#addAll', {
'markerIds': markers.keys.map((id) => id.value).toList(),
'coordinates': [
for (final point in markers.values) ...[
point.latitude,
point.longitude,
],
],
});