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

Source/modules/accessibility/AXNodeObject.h

 /*
  * 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 123 matching lines @@
     // Check whether certain properties can be modified.
     bool canSetFocusAttribute() const override;
     bool canSetValueAttribute() const override;
 
     // Properties of static elements.
     RGBA32 colorValue() const final;
     bool canvasHasFallbackContent() const final;
     bool deprecatedExposesTitleUIElement() const override;
     int headingLevel() const final;
     unsigned hierarchicalLevel() const final;
+    AccessibilityOrientation orientation() const override;
     String text() const override;
     AXObject* deprecatedTitleUIElement() const override;
 
     // Properties of interactive elements.
     AccessibilityButtonState checkboxOrRadioValue() const final;
     InvalidState invalidState() const final;
     // Only used when invalidState() returns InvalidStateOther.
     String ariaInvalidValue() const final;
     String valueDescription() const override;
     float valueForRange() const override;
@@ skipping 69 matching lines @@
     float stepValueForRange() const;
     AXObject* findChildWithTagName(const HTMLQualifiedName&) const;
     bool isDescendantOfElementType(const HTMLQualifiedName& tagName) const;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXNodeObject, isAXNodeObject());
 
 } // namespace blink
 
 #endif // AXNodeObject_h