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

Source/modules/accessibility/AXNodeObject.cpp

Index: Source/modules/accessibility/AXNodeObject.cpp
diff --git a/Source/modules/accessibility/AXNodeObject.cpp b/Source/modules/accessibility/AXNodeObject.cpp
index 2accbbfa87d80306397c5198e6c3eed26f529f5d..c4a18c8aab1261f85099c77607b87a9f4a1c462f 100644
--- a/Source/modules/accessibility/AXNodeObject.cpp
+++ b/Source/modules/accessibility/AXNodeObject.cpp
@@ -1255,6 +1255,37 @@ String AXNodeObject::deprecatedPlaceholder() const
     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.