Add Streams API support to XMLHttpRequest

Source/core/xml/XMLHttpRequest.h

Index: Source/core/xml/XMLHttpRequest.h
diff --git a/Source/core/xml/XMLHttpRequest.h b/Source/core/xml/XMLHttpRequest.h
index 91011d37059741b9da6f44f7b2302a5acdf22781..bc954dda27b9ad59005dd213b5384099dbb121d6 100644
--- a/Source/core/xml/XMLHttpRequest.h
+++ b/Source/core/xml/XMLHttpRequest.h
@@ -45,6 +45,7 @@ class DOMFormData;
 class ResourceRequest;
 class SecurityOrigin;
 class SharedBuffer;
+class Stream;
 class TextResourceDecoder;
 class ThreadableLoader;
 
@@ -62,13 +63,14 @@ public:
         LOADING = 3,
         DONE = 4
     };
-    
+
     enum ResponseTypeCode {
         ResponseTypeDefault,
-        ResponseTypeText, 
+        ResponseTypeText,
         ResponseTypeDocument,
         ResponseTypeBlob,
-        ResponseTypeArrayBuffer
+        ResponseTypeArrayBuffer,
+        ResponseTypeStream
     };
 
     virtual void contextDestroyed();
@@ -108,6 +110,7 @@ public:
     Document* optionalResponseXML() const { return m_responseDocument.get(); }
     Blob* responseBlob(ExceptionCode&);
     Blob* optionalResponseBlob() const { return m_responseBlob.get(); }
+    Stream* responseStream(ExceptionCode&);
     unsigned long timeout() const { return m_timeoutMilliseconds; }
     void setTimeout(unsigned long timeout, ExceptionCode&);
 
@@ -199,6 +202,7 @@ private:
     bool m_includeCredentials;
     unsigned long m_timeoutMilliseconds;
     RefPtr<Blob> m_responseBlob;
+    RefPtr<Stream> m_responseStream;
 
     RefPtr<ThreadableLoader> m_loader;
     State m_state;