Add toWebTextAreaElement

Source/web/WebTextAreaElement.cpp

Index: Source/web/WebTextAreaElement.cpp
diff --git a/Source/web/WebTextAreaElement.cpp b/Source/web/WebTextAreaElement.cpp
index 334f4f0b1f7ce970bf9a099312d1044c4e9176db..863c5b90dac971e72dc13ffd7f6bbc573b91d2bf 100644
--- a/Source/web/WebTextAreaElement.cpp
+++ b/Source/web/WebTextAreaElement.cpp
@@ -56,4 +56,12 @@ WebTextAreaElement::operator PassRefPtrWillBeRawPtr<HTMLTextAreaElement>() const
     return toHTMLTextAreaElement(m_private.get());
 }
 
+WebTextAreaElement* toWebTextAreaElement(WebElement* webElement)
+{
+    if (!isHTMLTextAreaElement(*webElement->unwrap<Element>()))

[tkent, 2014/05/19 05:29:51]

This will crash if webElement is nullptr.  Is it expected?

[keishi, 2014/05/19 08:24:00]

toWebInputElement was written like this. We are returning null for non textarea
elements so I have added a null check here.

+        return 0;
+
+    return static_cast<WebTextAreaElement*>(webElement);
+}
+
 } // namespace blink