Move ol.KEYBOARD_PAN_DURATION const to a constructor option

externs/olx.js

@@ -2385,6 +2385,7 @@ olx.interaction.DrawOptions.prototype.condition;
 
 /**
  * @typedef {{condition: (ol.events.ConditionType|undefined),
+ *     duration: (number|undefined),
  *     pixelDelta: (number|undefined)}}
  * @api
  */
@@ -2402,6 +2403,14 @@ olx.interaction.KeyboardPanOptions;
 olx.interaction.KeyboardPanOptions.prototype.condition;
 
 
+/**
+ * Animation duration in milliseconds. Default is `100`.
+ * @type {number|undefined}
+ * @api
+ */
+olx.interaction.KeyboardPanOptions.prototype.duration;
+
+
 /**
  * Pixel The amount to pan on each key press. Default is `128` pixels.
  * @type {number|undefined}

src/ol/interaction/keyboardpaninteraction.js

@@ -4,7 +4,6 @@ goog.require('goog.asserts');
 goog.require('goog.events.KeyCodes');
 goog.require('goog.events.KeyHandler.EventType');
 goog.require('goog.functions');
-goog.require('ol');
 goog.require('ol.coordinate');
 goog.require('ol.events.ConditionType');
 goog.require('ol.events.condition');
@@ -45,6 +44,12 @@ ol.interaction.KeyboardPan = function(opt_options) {
       goog.functions.and(ol.events.condition.noModifierKeys,
           ol.events.condition.targetNotEditable);
 
+  /**
+   * @private
+   * @type {number}
+   */
+  this.duration_ = goog.isDef(options.duration) ? options.duration : 100;
+
   /**
    * @private
    * @type {number}
@@ -89,8 +94,7 @@ ol.interaction.KeyboardPan.handleEvent = function(mapBrowserEvent) {
       }
       var delta = [deltaX, deltaY];
       ol.coordinate.rotate(delta, viewState.rotation);
-      ol.interaction.Interaction.pan(
-          map, view, delta, ol.KEYBOARD_PAN_DURATION);
+      ol.interaction.Interaction.pan(map, view, delta, this.duration_);
       mapBrowserEvent.preventDefault();
       stopEvent = true;
     }

src/ol/ol.js

@@ -170,12 +170,6 @@ ol.IS_LEGACY_IE = goog.userAgent.IE &&
     !goog.userAgent.isVersionOrHigher('9.0') && goog.userAgent.VERSION !== '';
 
 
-/**
- * @define {number} Keyboard pan duration.
- */
-ol.KEYBOARD_PAN_DURATION = 100;
-
-
 /**
  * @define {number} The maximum size in pixels of atlas images. Default is
  * `-1`, meaning it is not used (and `ol.WEBGL_MAX_TEXTURE_SIZE` is