Add logo option to ol.source.Source

src/objectliterals.exports

@@ -145,6 +145,7 @@
 @exportObjectLiteral ol.source.SourceOptions
 @exportObjectLiteralProperty ol.source.SourceOptions.attributions Array.<ol.Attribution>|undefined
 @exportObjectLiteralProperty ol.source.SourceOptions.extent ol.Extent|undefined
+@exportObjectLiteralProperty ol.source.SourceOptions.logo string|undefined
 @exportObjectLiteralProperty ol.source.SourceOptions.projection ol.ProjectionLike
 
 @exportObjectLiteral ol.source.StamenOptions

src/ol/source/source.js

@@ -39,6 +39,12 @@ ol.source.Source = function(sourceOptions) {
   this.attributions_ = goog.isDef(sourceOptions.attributions) ?
       sourceOptions.attributions : null;
 
+  /**
+   * @private
+   * @type {string|undefined}
+   */
+  this.logo_ = sourceOptions.logo;
+
 };
 goog.inherits(ol.source.Source, goog.events.EventTarget);
 
@@ -67,6 +73,14 @@ ol.source.Source.prototype.getExtent = function() {
 };
 
 
+/**
+ * @return {string|undefined} Logo.
+ */
+ol.source.Source.prototype.getLogo = function() {
+  return this.logo_;
+};
+
+
 /**
  * @return {ol.Projection} Projection.
  */
@@ -103,6 +117,14 @@ ol.source.Source.prototype.setExtent = function(extent) {
 };
 
 
+/**
+ * @param {string|undefined} logo Logo.
+ */
+ol.source.Source.prototype.setLogo = function(logo) {
+  this.logo_ = logo;
+};
+
+
 /**
  * @param {ol.Projection} projection Projetion.
  */