Resolve direction correctly when dir attribute is not in a defined state

Source/core/html/HTMLTextAreaElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 32 matching lines @@
 #include "core/frame/LocalFrame.h"
 #include "core/html/FormDataList.h"
 #include "core/html/forms/FormController.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/html/shadow/ShadowElementNames.h"
 #include "core/html/shadow/TextControlInnerElements.h"
 #include "core/page/Chrome.h"
 #include "core/page/ChromeClient.h"
 #include "core/rendering/RenderTextControlMultiLine.h"
 #include "platform/text/PlatformLocale.h"
+#include "platform/text/TextDirection.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 static const int defaultRows = 2;
 static const int defaultCols = 20;
 
@@ skipping 144 matching lines @@
 {
     if (name().isEmpty())
         return false;
 
     document().updateLayout();
 
     const String& text = (m_wrap == HardWrap) ? valueWithHardLineBreaks() : value();
     encoding.appendData(name(), text);
 
     const AtomicString& dirnameAttrValue = fastGetAttribute(dirnameAttr);
-    if (!dirnameAttrValue.isNull())
-        encoding.appendData(dirnameAttrValue, directionForFormData());
+    if (!dirnameAttrValue.isNull()) {
+        const AtomicString& dirValue = determineDirection() == RTL ? "rtl" : "ltr";
+        encoding.appendData(dirnameAttrValue, dirValue);
+    }
     return true;
 }
 
 void HTMLTextAreaElement::resetImpl()
 {
     setNonDirtyValue(defaultValue());
 }
 
 bool HTMLTextAreaElement::hasCustomFocusLogic() const
 {
@@ skipping 397 matching lines @@
 {
     return true;
 }
 
 bool HTMLTextAreaElement::supportsAutofocus() const
 {
     return true;
 }
 
 }