Introduce new API orientation() to expose aria-orientation correctly.

Source/modules/accessibility/AXScrollView.cpp

 /*
  * Copyright (C) 2011 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 47 matching lines @@
 
 AXObject* AXScrollView::scrollBar(AccessibilityOrientation orientation)
 {
     updateScrollbars();
 
     switch (orientation) {
     case AccessibilityOrientationVertical:
         return m_verticalScrollbar ? m_verticalScrollbar.get() : 0;
     case AccessibilityOrientationHorizontal:
         return m_horizontalScrollbar ? m_horizontalScrollbar.get() : 0;
+    case AccessibilityOrientationUndefined:
+        return 0;
     }
 
     return 0;
 }
 
 // If this is WebKit1 then the native scroll view needs to return the
 // AX information (because there are no scroll bar children in the FrameView object in WK1).
 // In WebKit2, the FrameView object will return the AX information (because there are no platform widgets).
 bool AXScrollView::isAttachment() const
 {
@@ skipping 166 matching lines @@
     return m_scrollView;
 }
 
 void AXScrollView::scrollTo(const IntPoint& point) const
 {
     if (m_scrollView)
         m_scrollView->setScrollPosition(point);
 }
 
 } // namespace blink