[WIP] XMLHttpRequest should parse as it receives chunks.

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 a17d17314b2b614e6ebced02c1dde15843217c60..a0b7fe1075deb69f00cb199d8b5903451c4ee754 100644
--- a/Source/core/xml/XMLHttpRequest.h
+++ b/Source/core/xml/XMLHttpRequest.h
@@ -41,6 +41,7 @@ namespace blink {
 class Blob;
 class DOMFormData;
 class Document;
+class DocumentParser;
 class ExceptionState;
 class ResourceRequest;
 class SecurityOrigin;
@@ -163,6 +164,11 @@ private:
     AtomicString responseMIMEType() const;
     bool responseIsXML() const;
 
+    PassOwnPtr<TextResourceDecoder> createDecoder() const;
+
+    void initResponseDocument();
+    void parseDocumentChunk(const char* data, int dataLength);
+
     bool areMethodAndURLValidForSend();
 
     bool initSend(ExceptionState&);
@@ -224,6 +230,7 @@ private:
 
     ScriptString m_responseText;
     RefPtrWillBeMember<Document> m_responseDocument;
+    RefPtrWillBeMember<DocumentParser> m_documentParser;
 
     RefPtr<SharedBuffer> m_binaryResponseBuilder;
     long long m_downloadedBlobLength;
@@ -252,7 +259,7 @@ private:
     bool m_includeCredentials;
     // Used to skip m_responseDocument creation if it's done previously. We need
     // this separate flag since m_responseDocument can be 0 for some cases.
-    bool m_createdDocument;
+    bool m_parsedResponse;
     bool m_error;
     bool m_uploadEventsAllowed;
     bool m_uploadComplete;