Function getBackingLayer

getBackingLayer(extension): Layer | SublayerLike
Returns the backing Layer or SublayerLike for a given LayerExtension or SublayerExtension.
Parameters
- extension: LayerExtension<LayerExtensionProperties> | SublayerExtension<SublayerExtensionProperties>
  The LayerExtension or SublayerExtension to get the backing layer from.
Returns Layer | SublayerLike
The backing Layer or SublayerLike.