Add experimental controls infrastructure, thanks @elemoine

src/ol/control/control.js

@@ -0,0 +1,17 @@
+goog.provide('ol.Control');
+
+goog.require('ol.MapBrowserEvent');
+
+
+
+/**
+ * @constructor
+ */
+ol.Control = function() {
+};
+
+
+/**
+ * @param {ol.MapBrowserEvent} event Map browser event.
+ */
+ol.Control.prototype.handleMapBrowserEvent = goog.abstractMethod;