Add 'error' property to exceptions thrown via Worker::importScripts.

Source/bindings/v8/V8ErrorHandler.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 19 matching lines @@
 
 #ifndef V8ErrorHandler_h
 #define V8ErrorHandler_h
 
 #include "bindings/v8/V8EventListener.h"
 #include "wtf/PassRefPtr.h"
 #include <v8.h>
 
 namespace WebCore {
 
+class ErrorEvent;
+class Frame;
+
 class V8ErrorHandler : public V8EventListener {
 public:
     static PassRefPtr<V8ErrorHandler> create(v8::Local<v8::Object> listener, bool isInline)
     {
         return adoptRef(new V8ErrorHandler(listener, isInline));
     }
 
+    static void storeExceptionOnErrorEventWrapper(ErrorEvent*, v8::Handle<v8::Value>, v8::Isolate*);
+
 private:
     V8ErrorHandler(v8::Local<v8::Object> listener, bool isInline);
 
     virtual v8::Local<v8::Value> callListenerFunction(ScriptExecutionContext*, v8::Handle<v8::Value> jsEvent, Event*);
     virtual bool shouldPreventDefault(v8::Local<v8::Value> returnValue);
 };
 
 } // namespace WebCore
 
 #endif // V8ErrorHandler_h