Turn DocumentParser::pinToMainThread into a cleaner api

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 b36edc7264065a840863168977d2c3595c42cf32..5d9846173669eda216c120a4ed10271e416a808e 100644
--- a/Source/core/html/parser/TextDocumentParser.h
+++ b/Source/core/html/parser/TextDocumentParser.h
@@ -32,14 +32,14 @@ namespace blink {
 
 class TextDocumentParser final : public HTMLDocumentParser {
 public:
-    static PassRefPtrWillBeRawPtr<TextDocumentParser> create(HTMLDocument& document)
+    static PassRefPtrWillBeRawPtr<TextDocumentParser> create(HTMLDocument& document, ParserSynchronizationPolicy syncPolicy)
     {
-        return adoptRefWillBeNoop(new TextDocumentParser(document));
+        return adoptRefWillBeNoop(new TextDocumentParser(document, syncPolicy));
     }
     virtual ~TextDocumentParser();
 
 private:
-    explicit TextDocumentParser(HTMLDocument&);
+    explicit TextDocumentParser(HTMLDocument&, ParserSynchronizationPolicy);
 
     virtual void appendBytes(const char*, size_t) override;
     void insertFakePreElement();