Enable XHR upload progress events for Workers.

Source/platform/network/ResourceRequest.h

 /*
  * Copyright (C) 2003, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  * Copyright (C) 2009, 2012 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 237 matching lines @@
     KURL m_url;
 
     ResourceRequestCachePolicy m_cachePolicy;
     double m_timeoutInterval;
     KURL m_firstPartyForCookies;
 
     String m_httpMethod;
     OwnPtr<CrossThreadHTTPHeaderMapData> m_httpHeaders;
     RefPtr<FormData> m_httpBody;
     bool m_allowCookies;
+    bool m_reportUploadProgress;
     bool m_hasUserGesture;
     bool m_downloadToFile;
     ResourceLoadPriority m_priority;
     int m_requestorID;
     int m_requestorProcessID;
     int m_appCacheHostID;
     ResourceRequest::TargetType m_targetType;
 };
 
 unsigned initializeMaximumHTTPConnectionCountPerHost();
 
 } // namespace WebCore
 
 #endif // ResourceRequest_h