Apply transform matrix to text coords

With this commit the transform matrix is applied to each texture coordinate, as opposed to each fragment. This leads to less calculation on the GPU.

src/ol/renderer/webgl/webgllayerrenderer.js

@@ -88,7 +88,7 @@ ol.renderer.webgl.Layer.prototype.getMapRenderer = function() {
 /**
  * @return {!goog.vec.Mat4.Number} Matrix.
  */
-ol.renderer.webgl.Layer.prototype.getMatrix = goog.abstractMethod;
+ol.renderer.webgl.Layer.prototype.getTexCoordMatrix = goog.abstractMethod;
 
 
 /**