Add updateWhileAnimating option

With this option, vector batches will be recreated with every frame.
For animations, this means that vector data won't be clipped to the
extent at which the animation started.

externs/olx.js

@@ -3220,6 +3220,7 @@ olx.layer.TileOptions.prototype.useInterimTilesOnError;
  *     saturation: (number|undefined),
  *     source: (ol.source.Vector|undefined),
  *     style: (ol.style.Style|Array.<ol.style.Style>|ol.style.StyleFunction|undefined),
+ *     updateWhileAnimating: (boolean|undefined),
  *     visible: (boolean|undefined)}}
  * @api
  */
@@ -3328,6 +3329,17 @@ olx.layer.VectorOptions.prototype.source;
 olx.layer.VectorOptions.prototype.style;
 
 
+/**
+ * When set to `true`, feature batches will be recreated during animations.
+ * This means that no vectors will be shown clipped, but the setting will have a
+ * performance impact for large amounts of vector data. When set to `false`,
+ * batches will be recreated when no animation is active.  Default is `false`.
+ * @type {boolean|undefined}
+ * @api
+ */
+olx.layer.VectorOptions.prototype.updateWhileAnimating;
+
+
 /**
  * Visibility. Default is `true` (visible).
  * @type {boolean|undefined}