ol.Map now have a LAYERGROUP property

The LAYERS property is gone.

src/ol/layer/layer.js

@@ -45,6 +45,16 @@ ol.layer.Layer.prototype.dispatchLoadEvent_ = function() {
 };
 
 
+/**
+ * @inheritDoc
+ */
+ol.layer.Layer.prototype.getLayersArray = function(opt_array) {
+  var array = (goog.isDef(opt_array)) ? opt_array : [];
+  array.push(this);
+  return array;
+};
+
+
 /**
  * @inheritDoc
  */

src/ol/layer/layerbase.js

@@ -122,6 +122,14 @@ ol.layer.LayerBase.prototype.getLayerState = function() {
 };
 
 
+/**
+ * @param {Array.<ol.layer.Layer>=} opt_array Array of layers (to be
+ *     modified in place).
+ * @return {Array.<ol.layer.Layer>} Array of layers.
+ */
+ol.layer.LayerBase.prototype.getLayersArray = goog.abstractMethod;
+
+
 /**
  * @param {{
  *     layers: Array.<ol.layer.Layer>,

src/ol/layer/layergroup.js

@@ -167,6 +167,18 @@ goog.exportProperty(
     ol.layer.LayerGroup.prototype.setLayers);
 
 
+/**
+ * @inheritDoc
+ */
+ol.layer.LayerGroup.prototype.getLayersArray = function(opt_array) {
+  var array = (goog.isDef(opt_array)) ? opt_array : [];
+  this.getLayers().forEach(function(layer) {
+    layer.getLayersArray(array);
+  });
+  return array;
+};
+
+
 /**
  * @inheritDoc
  */