The line of code for adding Google Maps to OpenLayers 3 or 4 is:
new ol.layer.Tile({
source: new ol.source.TileImage({url:
'http://mt0.google.com/vt/lyrs=m&x={x}&y={y}&z={z}'})
})
--
Sent from: http://osgeo-org.1560.x6.nabble.com/MapGuide-Users-f4182607.html