Improve fidelity of XHR progress events.

Source/core/xml/XMLHttpRequestUpload.cpp

Index: Source/core/xml/XMLHttpRequestUpload.cpp
diff --git a/Source/core/xml/XMLHttpRequestUpload.cpp b/Source/core/xml/XMLHttpRequestUpload.cpp
index c6bfde05d9f20536e017908ae72127d8e2bff0c7..b29142c6c0f094512b21922b5cfec72e798696ba 100644
--- a/Source/core/xml/XMLHttpRequestUpload.cpp
+++ b/Source/core/xml/XMLHttpRequestUpload.cpp
@@ -60,18 +60,27 @@ void XMLHttpRequestUpload::dispatchProgressEvent(unsigned long long bytesSent, u
     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