Add an "handleEvent" interaction option

src/ol/interaction/draganddropinteraction.js

@@ -29,7 +29,9 @@ ol.interaction.DragAndDrop = function(opt_options) {
 
   var options = goog.isDef(opt_options) ? opt_options : {};
 
-  goog.base(this);
+  goog.base(this, {
+    handleEvent: ol.interaction.DragAndDrop.handleEvent
+  });
 
   /**
    * @private
@@ -133,10 +135,12 @@ ol.interaction.DragAndDrop.prototype.handleResult_ = function(file, result) {
 
 
 /**
- * @inheritDoc
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} `false` to stop event propagation.
+ * @this {ol.interaction.DragAndDrop}
+ * @api
  */
-ol.interaction.DragAndDrop.prototype.handleMapBrowserEvent =
-    goog.functions.TRUE;
+ol.interaction.DragAndDrop.handleEvent = goog.functions.TRUE;
 
 
 /**