Use downloadToFile option when XHR downloads a Blob

Source/core/loader/FrameFetchContext.cpp

 /*
  * Copyright (C) 2013 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 117 matching lines @@
     InspectorInstrumentation::didReceiveResourceResponse(cookie, identifier, ensureLoader(loader), r, resourceLoader);
 }
 
 void FrameFetchContext::dispatchDidReceiveData(DocumentLoader*, unsigned long identifier, const char* data, int dataLength, int encodedDataLength)
 {
     if (Page* page = m_frame->page())
         page->progress().incrementProgress(identifier, data, dataLength);
     InspectorInstrumentation::didReceiveData(m_frame, identifier, data, dataLength, encodedDataLength);
 }
 
+void FrameFetchContext::dispatchDidDownloadData(DocumentLoader*, unsigned long identifier, int dataLength, int encodedDataLength)
+{
+    if (Page* page = m_frame->page())
+        page->progress().incrementProgress(identifier, 0, dataLength);
+    InspectorInstrumentation::didReceiveData(m_frame, identifier, 0, dataLength, encodedDataLength);
+}
+
 void FrameFetchContext::dispatchDidFinishLoading(DocumentLoader* loader, unsigned long identifier, double finishTime)
 {
     if (Page* page = m_frame->page())
         page->progress().completeProgress(identifier);
     m_frame->loader()->client()->dispatchDidFinishLoading(loader, identifier);
 
     InspectorInstrumentation::didFinishLoading(m_frame, identifier, ensureLoader(loader), finishTime);
 }
 
 void FrameFetchContext::dispatchDidFail(DocumentLoader* loader, unsigned long identifier, const ResourceError& error)
@@ skipping 11 matching lines @@
     if (dataLength > 0)
         dispatchDidReceiveData(ensureLoader(loader), identifier, data, dataLength, encodedDataLength);
 
     if (error.isNull())
         dispatchDidFinishLoading(ensureLoader(loader), identifier, 0);
     else
         dispatchDidFail(ensureLoader(loader), identifier, error);
 }
 
 } // namespace WebCore