Defines in a namespace that can be required

For consistency, all defines are in the ol namespace.  If they are to be moved to another namespace, they need to be requireable.

src/ol/interaction/dragzoominteraction.js

@@ -1,6 +1,7 @@
 goog.provide('ol.interaction.DragZoom');
 
 goog.require('goog.asserts');
+goog.require('ol');
 goog.require('ol.events.condition');
 goog.require('ol.extent');
 goog.require('ol.interaction.DragBox');
@@ -9,12 +10,6 @@ goog.require('ol.style.Stroke');
 goog.require('ol.style.Style');
 
 
-/**
- * @define {number} Animation duration.
- */
-ol.interaction.DRAGZOOM_ANIMATION_DURATION = 200;
-
-
 
 /**
  * Allows the user to zoom the map by clicking and dragging on the map,
@@ -62,5 +57,5 @@ ol.interaction.DragZoom.prototype.onBoxEnd = function() {
   var center = ol.extent.getCenter(extent);
   ol.interaction.Interaction.zoom(map, view,
       view.getResolutionForExtent(extent, map.getSize()),
-      center, ol.interaction.DRAGZOOM_ANIMATION_DURATION);
+      center, ol.DRAGZOOM_ANIMATION_DURATION);
 };