Add ol.MapBrowserEvent.stopOtherInteractions

When called, stops the interaction chain.

src/ol/mapbrowserevent.js

@@ -39,6 +39,11 @@ ol.MapBrowserEvent = function(type, map, browserEvent, opt_frameState) {
    */
   this.coordinate_ = null;
 
+  /**
+   * @type {boolean}
+   */
+  this.otherInteractionsStopped = false;
+
   /**
    * @private
    * @type {ol.Pixel}
@@ -107,6 +112,14 @@ ol.MapBrowserEvent.prototype.preventDefault = function() {
 };
 
 
+/**
+ * Stop the interaction chain.
+ */
+ol.MapBrowserEvent.prototype.stopOtherInteractions = function() {
+  this.otherInteractionsStopped = true;
+};
+
+
 /**
  * @override
  */