Add a worldExtent to ol.proj.Projection

src/ol/proj/epsg3857projection.js

@@ -23,7 +23,8 @@ ol.proj.EPSG3857_ = function(code) {
     code: code,
     units: ol.proj.Units.METERS,
     extent: ol.proj.EPSG3857.EXTENT,
-    global: true
+    global: true,
+    worldExtent: ol.proj.EPSG3857.WORLD_EXTENT
   });
 };
 goog.inherits(ol.proj.EPSG3857_, ol.proj.Projection);
@@ -61,6 +62,13 @@ ol.proj.EPSG3857.EXTENT = [
 ];
 
 
+/**
+ * @const
+ * @type {ol.Extent}
+ */
+ol.proj.EPSG3857.WORLD_EXTENT = [-180, -85, 180, 85];
+
+
 /**
  * Lists several projection codes with the same meaning as EPSG:3857.
  *