Bug 1188797 - Create a new permission to allow opening hidden popups in B2G. r=fabrice

dom/apps/PermissionsTable.jsm

@@ -573,6 +573,12 @@ this.PermissionsTable =  { geolocation: {
                              privileged: ALLOW_ACTION,
                              certified: ALLOW_ACTION
                            },
+                           "open-hidden-window": {
+                             app: DENY_ACTION,
+                             trusted: DENY_ACTION,
+                             privileged: DENY_ACTION,
+                             certified: ALLOW_ACTION
+                           },
                          };
 
 /**