Revert of Revert "Moved text decoding to the parser thread"

Source/core/html/parser/TextDocumentParser.h

Index: Source/core/html/parser/TextDocumentParser.h
diff --git a/Source/core/html/parser/TextDocumentParser.h b/Source/core/html/parser/TextDocumentParser.h
index 255eccfdba6af3b49f4aed64ea4f2f6dfb8a8b79..9134274bccb3390ff660289a1f491b6140173b0a 100644
--- a/Source/core/html/parser/TextDocumentParser.h
+++ b/Source/core/html/parser/TextDocumentParser.h
@@ -41,7 +41,7 @@ public:
 private:
     explicit TextDocumentParser(HTMLDocument*);
 
-    virtual void append(PassRefPtr<StringImpl>) OVERRIDE;
+    virtual void appendBytes(const char*, size_t) OVERRIDE;
     void insertFakePreElement();
 
     bool m_haveInsertedFakePreElement;