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

Source/core/html/parser/TextDocumentParser.cpp

Index: Source/core/html/parser/TextDocumentParser.cpp
diff --git a/Source/core/html/parser/TextDocumentParser.cpp b/Source/core/html/parser/TextDocumentParser.cpp
index 38175a0f6bfea99a4338b6a7d7afcd1f8b2bd707..d29935a77c95559a13dbde1c3f6f887caa709d43 100644
--- a/Source/core/html/parser/TextDocumentParser.cpp
+++ b/Source/core/html/parser/TextDocumentParser.cpp
@@ -42,11 +42,11 @@ TextDocumentParser::~TextDocumentParser()
 {
 }
 
-void TextDocumentParser::append(PassRefPtr<StringImpl> text)
+void TextDocumentParser::appendBytes(const char* data, size_t length)
 {
     if (!m_haveInsertedFakePreElement)
         insertFakePreElement();
-    HTMLDocumentParser::append(text);
+    HTMLDocumentParser::appendBytes(data, length);
 }
 
 void TextDocumentParser::insertFakePreElement()