Add missing goog.inherits for ol.render.canvas.Immediate

src/ol/render/canvas/canvasimmediate.js

@@ -36,6 +36,7 @@ goog.require('ol.vec.Mat4');
  * @struct
  */
 ol.render.canvas.Immediate = function(context, pixelRatio, extent, transform, viewRotation) {
+  goog.base(this);
 
   /**
    * @private
@@ -237,6 +238,7 @@ ol.render.canvas.Immediate = function(context, pixelRatio, extent, transform, vi
   this.tmpLocalTransform_ = goog.vec.Mat4.createNumber();
 
 };
+goog.inherits(ol.render.canvas.Immediate, ol.render.VectorContext);
 
 
 /**
@@ -696,12 +698,6 @@ ol.render.canvas.Immediate.prototype.drawMultiPolygonGeometry = function(multiPo
 };
 
 
-/**
- * @inheritDoc
- */
-ol.render.canvas.Immediate.prototype.drawText = goog.abstractMethod;
-
-
 /**
  * FIXME: empty description for jsdoc
  */

test/spec/ol/render/canvasimmediate.test.js

@@ -2,6 +2,14 @@ goog.provide('ol.test.render.canvas.Immediate');
 
 describe('ol.render.canvas.Immediate', function() {
 
+  describe('constructor', function() {
+    it('creates an instance', function() {
+      var instance = new ol.render.canvas.Immediate();
+      expect(instance).to.be.a(ol.render.canvas.Immediate);
+      expect(instance).to.be.a(ol.render.VectorContext);
+    });
+  });
+
   describe('#flush', function() {
     it('calls callback in correct z-order', function() {
       var canvas = new ol.render.canvas.Immediate();
@@ -110,4 +118,5 @@ describe('ol.render.canvas.Immediate', function() {
 });
 
 goog.require('ol.geom.MultiPolygon');
+goog.require('ol.render.VectorContext');
 goog.require('ol.render.canvas.Immediate');