Make map handle background color changes

src/ol/map.js

@@ -287,6 +287,9 @@ ol.Map = function(mapOptions) {
       this.handleViewChanged_, false, this);
   goog.events.listen(this, ol.Object.getChangedEventType(ol.MapProperty.SIZE),
       this.handleSizeChanged_, false, this);
+  goog.events.listen(
+      this, ol.Object.getChangedEventType(ol.MapProperty.BACKGROUND_COLOR),
+      this.handleBackgroundColorChanged_, false, this),
   this.setValues(mapOptionsInternal.values);
 
   // this gives the map an initial size
@@ -561,6 +564,14 @@ ol.Map.prototype.handlePostRender = function() {
 };
 
 
+/**
+ * @private
+ */
+ol.Map.prototype.handleBackgroundColorChanged_ = function() {
+  this.render();
+};
+
+
 /**
  * @protected
  */

src/ol/renderer/canvas/canvasmaprenderer.js

@@ -76,14 +76,6 @@ ol.renderer.canvas.Map.prototype.getCanvas = function() {
 };
 
 
-/**
- * @inheritDoc
- */
-ol.renderer.canvas.Map.prototype.handleBackgroundColorChanged = function() {
-  this.getMap().render();
-};
-
-
 /**
  * @param {goog.events.Event} event Event.
  * @protected

src/ol/renderer/maprenderer.js

@@ -52,10 +52,6 @@ ol.renderer.Map = function(container, map) {
    * @type {Array.<number>}
    */
   this.mapListenerKeys_ = [
-    goog.events.listen(
-        map, ol.Object.getChangedEventType(ol.MapProperty.BACKGROUND_COLOR),
-        this.handleBackgroundColorChanged, false, this),
-
     goog.events.listen(
         map, ol.Object.getChangedEventType(ol.MapProperty.LAYERS),
         this.handleLayersChanged, false, this)
@@ -157,12 +153,6 @@ ol.renderer.Map.prototype.getMap = function() {
 };
 
 
-/**
- * Handle background color changed.
- */
-ol.renderer.Map.prototype.handleBackgroundColorChanged = goog.nullFunction;
-
-
 /**
  * @param {ol.CollectionEvent} collectionEvent Collection event.
  * @protected

src/ol/renderer/webgl/webglmaprenderer.js

@@ -409,14 +409,6 @@ ol.renderer.webgl.Map.prototype.getShader = function(shaderObject) {
 };
 
 
-/**
- * @inheritDoc
- */
-ol.renderer.webgl.Map.prototype.handleBackgroundColorChanged = function() {
-  this.getMap().render();
-};
-
-
 /**
  * @param {goog.events.Event} event Event.
  * @protected