Add ol.renderer.webgl.ImageLayer

src/ol/renderer/webgl/webgltilelayerrenderer.js

@@ -141,6 +141,12 @@ ol.renderer.webgl.TileLayer = function(mapRenderer, tileLayer) {
    */
   this.texCoordMatrix_ = goog.vec.Mat4.createNumber();
 
+  /**
+   * @private
+   * @type {!goog.vec.Mat4.Number}
+   */
+  this.vertexCoordMatrix_ = goog.vec.Mat4.createNumberIdentity();
+
   /**
    * @private
    * @type {ol.TileRange}
@@ -237,6 +243,14 @@ ol.renderer.webgl.TileLayer.prototype.getTexture = function() {
 };
 
 
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.TileLayer.prototype.getVertexCoordMatrix = function() {
+  return this.vertexCoordMatrix_;
+};
+
+
 /**
  * @return {ol.layer.TileLayer} Tile layer.
  */