Added field to error structures to signal existence of a stale copy in

Source/platform/exported/WebURLError.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 35 matching lines @@
 
 WebURLError& WebURLError::operator=(const ResourceError& error)
 {
     if (error.isNull()) {
         *this = WebURLError();
     } else {
         domain = error.domain();
         reason = error.errorCode();
         unreachableURL = KURL(ParsedURLString, error.failingURL());
         isCancellation = error.isCancellation();
+        staleCopyInCache = error.staleCopyInCache();
         localizedDescription = error.localizedDescription();
     }
     return *this;
 }
 
 WebURLError::operator ResourceError() const
 {
     if (!reason)
         return ResourceError();
     CString spec = unreachableURL.spec();
     ResourceError resourceError = ResourceError(domain, reason, String::fromUTF8(spec.data(), spec.length()), localizedDescription);
     resourceError.setIsCancellation(isCancellation);
+    resourceError.setStaleCopyInCache(staleCopyInCache);
     return resourceError;
 }
 
 } // namespace blink