Moved text decoding to the parser thread

Source/core/dom/DecodedDataDocumentParser.h

Index: Source/core/dom/DecodedDataDocumentParser.h
diff --git a/Source/core/dom/DecodedDataDocumentParser.h b/Source/core/dom/DecodedDataDocumentParser.h
index 453147d0ecdbddad2e90e7e9cda345afa016b534..59b56d051584613e0289785f2b4c0de985232ffe 100644
--- a/Source/core/dom/DecodedDataDocumentParser.h
+++ b/Source/core/dom/DecodedDataDocumentParser.h
@@ -42,11 +42,13 @@ public:
     // The below functions are used by DocumentWriter (the loader).
     virtual void appendBytes(const char* bytes, size_t length) OVERRIDE;
     virtual void flush() OVERRIDE;
-    virtual bool needsDecoder() const OVERRIDE { return !m_decoder; }
+    virtual bool needsDecoder() const OVERRIDE { return m_needsDecoder; }
     virtual void setDecoder(PassOwnPtr<TextResourceDecoder>) OVERRIDE;
     virtual TextResourceDecoder* decoder() OVERRIDE;
     virtual void setHasAppendedData() OVERRIDE;
 
+    PassOwnPtr<TextResourceDecoder> takeDecoder();
+
 protected:
     explicit DecodedDataDocumentParser(Document*);
     virtual ~DecodedDataDocumentParser();
@@ -58,6 +60,7 @@ private:
     void updateDocument(String& decodedData);
 
     bool m_hasAppendedData;
+    bool m_needsDecoder;
     OwnPtr<TextResourceDecoder> m_decoder;
 };