supportsTile method
Returns true if MapDatabase contains the given tile.
@param tile tile to be rendered. @return true if tile is part of database.
Implementation
@override
Future<bool> supportsTile(Tile tile, Projection projection) async {
for (Datastore mdb in mapDatabases) {
if ((await mdb.supportsTile(tile, projection))) {
return true;
}
}
return false;
}