Add toWebTextAreaElement

public/web/WebTextAreaElement.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 41 matching lines @@
     }
     void assign(const WebTextAreaElement& element) { WebFormControlElement::assign(element); }
 
 #if BLINK_IMPLEMENTATION
     WebTextAreaElement(const PassRefPtrWillBeRawPtr<WebCore::HTMLTextAreaElement>&);
     WebTextAreaElement& operator=(const PassRefPtrWillBeRawPtr<WebCore::HTMLTextAreaElement>&);
     operator PassRefPtrWillBeRawPtr<WebCore::HTMLTextAreaElement>() const;
 #endif
 };
 
+BLINK_EXPORT WebTextAreaElement* toWebTextAreaElement(WebElement*);

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

Please add a comment for a behavior in case that the specified pointer is
nullptr or a non-TextArea.

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

Done.

+
+inline const WebTextAreaElement* toWebTextAreaElement(const WebElement* element)
+{
+    return toWebTextAreaElement(const_cast<WebElement*>(element));
+}
+
 } // namespace blink
 
 #endif