Generate EventListener attributes of non-EventTarget classes.

client/dom/generated/src/frog/WorkerContext.dart

 
 class WorkerContext native "*WorkerContext" {
 
   static final int PERSISTENT = 1;
 
   static final int TEMPORARY = 0;
 
   WorkerLocation location;
 
   WorkerNavigator navigator;
 
+  EventListener onerror;
+
   WorkerContext self;
 
   NotificationCenter webkitNotifications;
 
   DOMURL webkitURL;
 
   void addEventListener(String type, EventListener listener, [bool useCapture = null]) native;
 
   void clearInterval(int handle) native;
 
@@ skipping 20 matching lines @@
   DOMFileSystemSync webkitRequestFileSystemSync(int type, int size) native;
 
   EntrySync webkitResolveLocalFileSystemSyncURL(String url) native;
 
   void webkitResolveLocalFileSystemURL(String url, [EntryCallback successCallback = null, ErrorCallback errorCallback = null]) native;
 
   var dartObjectLocalStorage;
 
   String get typeName() native;
 }