Use downloadToFile option when XHR downloads a Blob

Source/core/loader/FrameFetchContext.cpp

Index: Source/core/loader/FrameFetchContext.cpp
diff --git a/Source/core/loader/FrameFetchContext.cpp b/Source/core/loader/FrameFetchContext.cpp
index 387f13a8a254c92d00691e9d297a8cf1cf0019e9..cb5611d35da9bb4d120698089ea1661ffcb7b801 100644
--- a/Source/core/loader/FrameFetchContext.cpp
+++ b/Source/core/loader/FrameFetchContext.cpp
@@ -135,6 +135,13 @@ void FrameFetchContext::dispatchDidReceiveData(DocumentLoader*, unsigned long id
     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::didReceiveDataWithoutData(m_frame, identifier, dataLength, encodedDataLength);

[yusukesuzuki, 2013/09/19 04:23:36]

Since it is implementation details that XHR uses the downloadToFile option when
response type is 'blob', we use `InspectorInstrumentation::didReceiveData*`
interfaces.

+}
+
 void FrameFetchContext::dispatchDidFinishLoading(DocumentLoader* loader, unsigned long identifier, double finishTime)
 {
     if (Page* page = m_frame->page())