New crossOriginKeyword property.

Set to 'anonymous' for Layer.OSM and Layer.Bing, and not used by default for other layers.

lib/OpenLayers/Layer/Bing.js

@@ -107,6 +107,9 @@ OpenLayers.Layer.Bing = OpenLayers.Class(OpenLayers.Layer.XYZ, {
         
         var newArgs = [name, null, options];
         OpenLayers.Layer.XYZ.prototype.initialize.apply(this, newArgs);
+        this.tileOptions = OpenLayers.Util.extend({
+            crossOriginKeyword: 'anonymous'
+        }, this.options.tileOptions);
         this.loadMetadata(); 
     },
 

lib/OpenLayers/Layer/OSM.js

@@ -73,6 +73,12 @@ OpenLayers.Layer.OSM = OpenLayers.Class(OpenLayers.Layer.XYZ, {
      *     layer option can be set in this object (e.g.
      *     <OpenLayers.Layer.Grid.buffer>).
      */
+    initialize: function(name, url, options) {
+        OpenLayers.Layer.XYZ.prototype.initialize.apply(this, arguments);
+        this.tileOptions = OpenLayers.Util.extend({
+            crossOriginKeyword: 'anonymous'
+        }, this.options && this.options.tileOptions);
+    },
 
     /**
      * Method: clone