(You could look it up in the above list). I found only a couple of times something with "layer", and no method to set/change visibility of a layer. I suppose all the layer methods (like many others) are up to now only empty place holders.
In addition to that, it depends on what features can be read from the .dae model. As we know, SketchUp's .dae exporter doesn't preserve scenes and layers (but on the SketchUp Showcase they have scenes!). Similarly, the Pompidou Viewer also contains methods for handling geometric primitives and materials (edges etc.) but models are up to now only loaded as a big mesh object, without distinction into single entities.