Improve fidelity of XHR progress events.

Source/core/xml/XMLHttpRequestUpload.cpp

 /*
  * Copyright (C) 2008 Apple 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 42 matching lines @@
     return m_xmlHttpRequest->executionContext();
 }
 
 void XMLHttpRequestUpload::dispatchProgressEvent(unsigned long long bytesSent, unsigned long long totalBytesToBeSent)
 {
     m_lastBytesSent = bytesSent;
     m_lastTotalBytesToBeSent = totalBytesToBeSent;
     dispatchEvent(XMLHttpRequestProgressEvent::create(EventTypeNames::progress, true, bytesSent, totalBytesToBeSent));
 }
 
-void XMLHttpRequestUpload::dispatchEventAndLoadEnd(PassRefPtr<Event> event)
+void XMLHttpRequestUpload::dispatchEventAndLoadEnd(const AtomicString& type, bool lengthComputable, unsigned long long bytesSent, unsigned long long total)
 {
-    ASSERT(event->type() == EventTypeNames::load || event->type() == EventTypeNames::abort || event->type() == EventTypeNames::error || event->type() == EventTypeNames::timeout);
+    ASSERT(type == EventTypeNames::load || type == EventTypeNames::abort || type == EventTypeNames::error || type == EventTypeNames::timeout);
 
-    dispatchEvent(event);
-    dispatchEvent(XMLHttpRequestProgressEvent::create(EventTypeNames::loadend));
+    if (!lengthComputable && !bytesSent)
+        bytesSent = m_lastBytesSent;
+
+    if (!lengthComputable && !total) {
+        total = m_lastTotalBytesToBeSent;
+        if (total >= 0 && bytesSent <= total)
+            lengthComputable = true;
+    }
+
+    dispatchEvent(XMLHttpRequestProgressEvent::create(type, lengthComputable, bytesSent, total));
+    dispatchEvent(XMLHttpRequestProgressEvent::create(EventTypeNames::loadend, lengthComputable, bytesSent, total));
 }
 
 void XMLHttpRequestUpload::handleRequestError(const AtomicString& type)
 {
     dispatchEvent(XMLHttpRequestProgressEvent::create(EventTypeNames::progress, true, m_lastBytesSent, m_lastTotalBytesToBeSent));
-    dispatchEventAndLoadEnd(XMLHttpRequestProgressEvent::create(type));
+    dispatchEventAndLoadEnd(type, true, m_lastBytesSent, m_lastTotalBytesToBeSent);
 }
 
 } // namespace WebCore