overviewPolyline property
      
      DirectionsPolylineBuilder
      get
      overviewPolyline
      
    
    
    
Implementation
DirectionsPolylineBuilder get overviewPolyline =>
    _$this._overviewPolyline ??= new DirectionsPolylineBuilder();
      
      set
      overviewPolyline
      (DirectionsPolylineBuilder overviewPolyline) 
      
    
    
    
Implementation
set overviewPolyline(DirectionsPolylineBuilder overviewPolyline) =>
    _$this._overviewPolyline = overviewPolyline;