graticule.js now uses vectorContext.extent_

When creating the graticule use the extent from the vectorContext instead of the frameState to determine what parallels and meridians should be created. This will allow the graticule to be drawn correctly on views that wrap across the dateline.

src/ol/graticule.js

@@ -356,7 +356,7 @@ ol.Graticule.prototype.getParallels = function() {
 ol.Graticule.prototype.handlePostCompose_ = function(e) {
   var vectorContext = e.vectorContext;
   var frameState = e.frameState;
-  var extent = frameState.extent;
+  var extent = vectorContext.extent_;
   var viewState = frameState.viewState;
   var center = viewState.center;
   var projection = viewState.projection;