Update Error Event inside a worker to provide the exact exception value

third_party/WebKit/Source/core/events/ErrorEvent.cpp

 /*
  * Copyright (C) 2009 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 41 matching lines @@
   m_location = SourceLocation::create(
       initializer.hasFilename() ? initializer.filename() : String(),
       initializer.hasLineno() ? initializer.lineno() : 0,
       initializer.hasColno() ? initializer.colno() : 0, nullptr);
   if (initializer.hasError())
     m_error = initializer.error();
 }
 
 ErrorEvent::ErrorEvent(const String& message,
                        std::unique_ptr<SourceLocation> location,
+                       ScriptValue error,
                        DOMWrapperWorld* world)
     : Event(EventTypeNames::error, false, true),
       m_sanitizedMessage(message),
       m_location(std::move(location)),
+      m_error(error),
       m_world(world) {}
 
 void ErrorEvent::setUnsanitizedMessage(const String& message) {
   DCHECK(m_unsanitizedMessage.isEmpty());
   m_unsanitizedMessage = message;
 }
 
 ErrorEvent::~ErrorEvent() {}
 
 const AtomicString& ErrorEvent::interfaceName() const {
@@ skipping 10 matching lines @@
   if (world() != &scriptState->world())
     return ScriptValue();
   return m_error;
 }
 
 DEFINE_TRACE(ErrorEvent) {
   Event::trace(visitor);
 }
 
 }  // namespace blink