Add text field change handling for autofill preview in textarea element.

Source/web/WebTextAreaElement.cpp

 /*
  * Copyright (C) 2010 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 42 matching lines @@
 void WebTextAreaElement::setSuggestedValue(const WebString& value)
 {
     unwrap<HTMLTextAreaElement>()->setSuggestedValue(value);
 }
 
 WebString WebTextAreaElement::suggestedValue() const
 {
     return constUnwrap<HTMLTextAreaElement>()->suggestedValue();
 }
 
+void WebTextAreaElement::setSelectionRange(int start, int end)
+{
+    unwrap<HTMLTextAreaElement>()->setSelectionRange(start, end);
+}
+
 WebTextAreaElement::WebTextAreaElement(const PassRefPtr<HTMLTextAreaElement>& element)
     : WebFormControlElement(element)
 {
 }
 
 WebTextAreaElement& WebTextAreaElement::operator=(const PassRefPtr<HTMLTextAreaElement>& element)
 {
     m_private = element;
     return *this;
 }
 
 WebTextAreaElement::operator PassRefPtr<HTMLTextAreaElement>() const
 {
     return toHTMLTextAreaElement(m_private.get());
 }
 
 } // namespace blink