on Add
Attaches this layer to controller, wires up its GL renderer, and starts observing the timeline's play/pause state.
Not yet implemented on TileLayer; simple no-context registration is not used by this layer.
open override fun onAdd(context: RenderContext<Any>, tileLayer: TileLayer, controller: MapboxMapController)
Not yet implemented on TileLayer; this render-context/owning-layer overload is used by renderer classes instead.