Introduce new API language() to test lang attribute.

Source/web/WebAXObject.cpp

 /*
  * Copyright (C) 2009 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 812 matching lines @@
 WebString WebAXObject::title() const
 {
     if (isDetached())
         return WebString();
 
     ASSERT(isLayoutClean(m_private->document()));
 
     return m_private->title();
 }
 
+WebString WebAXObject::language() const
+{
+    if (isDetached())
+        return WebString();
+
+    return m_private->language();
+}
+
 WebAXObject WebAXObject::titleUIElement() const
 {
     if (isDetached())
         return WebAXObject();
 
     if (!m_private->exposesTitleUIElement())
         return WebAXObject();
 
     return WebAXObject(m_private->titleUIElement());
 }
@@ skipping 387 matching lines @@
     m_private = object;
     return *this;
 }
 
 WebAXObject::operator WTF::PassRefPtr<AXObject>() const
 {
     return m_private.get();
 }
 
 } // namespace blink