Added layout test for aria-orientation and cleaned up code. Also exposed hr element with an orienta…

Source/modules/accessibility/AXNodeObject.cpp

 /*
  * Copyright (C) 2012, 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:
  *
  * 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 1237 matching lines @@
             HTMLInputElement* inputElement = toHTMLInputElement(node());
             placeholder = inputElement->strippedPlaceholder();
         } else if (isHTMLTextAreaElement(*node())) {
             HTMLTextAreaElement* textAreaElement = toHTMLTextAreaElement(node());
             placeholder = textAreaElement->strippedPlaceholder();
         }
     }
     return placeholder;
 }
 
+AccessibilityOrientation AXNodeObject::orientation() const
+{
+    const AtomicString& ariaOrientation = getAttribute(aria_orientationAttr);
+    AccessibilityOrientation orientation = AccessibilityOrientationUndefined;
+
+    switch (roleValue()) {
+    case ComboBoxRole:
+    case ListBoxRole:
+    case MenuRole:
+    case ScrollBarRole:
+    case TreeRole:
+        orientation = AccessibilityOrientationVertical;
+        if (equalIgnoringCase(ariaOrientation, "horizontal"))
+            orientation = AccessibilityOrientationHorizontal;
+
+        return orientation;
+    case MenuBarRole:
+    case SliderRole:
+    case SplitterRole:
+    case TabListRole:
+    case ToolbarRole:
+        orientation = AccessibilityOrientationHorizontal;
+        if (equalIgnoringCase(ariaOrientation, "vertical"))
+            orientation = AccessibilityOrientationVertical;
+
+        return orientation;
+    default:
+        return AXObject::orientation();
+    }
+}
+
 String AXNodeObject::text() const
 {
     // If this is a user defined static text, use the accessible name computation.
     if (ariaRoleAttribute() == StaticTextRole)
         return ariaAccessibilityDescription();
 
     if (!isTextControl())
         return String();
 
     Node* node = this->node();
@@ skipping 1516 matching lines @@
     return textAlternative;
 }
 
 DEFINE_TRACE(AXNodeObject)
 {
     visitor->trace(m_node);
     AXObject::trace(visitor);
 }
 
 } // namespace blink