add class to Layer.Grid layer div

lib/OpenLayers/Layer/Grid.js

@@ -188,6 +188,14 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
      */
     removeBackBufferDelay: 2500,
 
+    /**
+     * Property: className
+     * {String} Name of the class added to the layer div. Default is
+     *     "olLayerGridSingleTile" for <singleTile> layers, and
+     *     "olLayerGridTile" for non-<singleTile> layers.
+     */
+    className: null,
+
     /**
      * Register a listener for a particular event with the following syntax:
      * (code)
@@ -233,6 +241,11 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
         this.grid = [];
         this.tileQueue = [];
         
+        if (this.className === null) {
+            this.className = this.singleTile ? 'olLayerGridSingleTile' :
+                                               'olLayerGridTile';
+        }
+
         if (!OpenLayers.Animation.isNative) {
             this.deferMoveGriddedTiles = OpenLayers.Function.bind(function() {
                 this.moveGriddedTiles(true);
@@ -241,6 +254,17 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
         }
     },
 
+    /**
+     * Method: setMap
+     *
+     * Parameters:
+     * map - {<OpenLayers.Map>} The map.
+     */
+    setMap: function(map) {
+        OpenLayers.Layer.HTTPRequest.prototype.setMap.call(this, map);
+        OpenLayers.Element.addClass(this.div, this.className);
+    },
+
     /**
      * Method: removeMap
      * Called when the layer is removed from the map.