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

Source/core/html/HTMLTextAreaElement.cpp

Index: Source/core/html/HTMLTextAreaElement.cpp
diff --git a/Source/core/html/HTMLTextAreaElement.cpp b/Source/core/html/HTMLTextAreaElement.cpp
index 59385d87e6c9509bb5ce24461e767df1672eb510..62edbb91755d940aeabbc27ba8fbd4df87389bc7 100644
--- a/Source/core/html/HTMLTextAreaElement.cpp
+++ b/Source/core/html/HTMLTextAreaElement.cpp
@@ -50,6 +50,7 @@
 #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"
 
@@ -214,8 +215,10 @@ bool HTMLTextAreaElement::appendFormData(FormDataList& encoding, bool)
     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;
 }