Use the className param in ol.layer.Heatmap

src/ol/layer/Heatmap.js

@@ -182,6 +182,7 @@ class Heatmap extends VectorLayer {
    */
   createRenderer() {
     return new WebGLPointsLayerRenderer(this, {
+      className: this.getClassName(),
       attributes: [
         {
           name: 'weight',

src/ol/layer/WebGLPoints.js

@@ -96,6 +96,7 @@ class WebGLPointsLayer extends Layer {
    */
   createRenderer() {
     return new WebGLPointsLayerRenderer(this, {
+      className: this.getClassName(),
       vertexShader: this.parseResult_.builder.getSymbolVertexShader(),
       fragmentShader: this.parseResult_.builder.getSymbolFragmentShader(),
       hitVertexShader: