Exposes <hr> elements that do not have an ARIA label.

third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp

Index: third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp b/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
index 5aaa287b9f6335f975cb79aa1a0d201bc3452dac..02d3e1a27524aa6a4b910eacb3c805f9c73f7de0 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
@@ -670,6 +670,9 @@ bool AXLayoutObject::computeAccessibilityIsIgnored(IgnoredReasons* ignoredReason
     if (roleValue() == DetailsRole)
         return false;
 
+    if (roleValue() == MarkRole)
+        return false;
+
     if (roleValue() == MathRole)
         return false;
 
@@ -679,10 +682,10 @@ bool AXLayoutObject::computeAccessibilityIsIgnored(IgnoredReasons* ignoredReason
     if (roleValue() == RubyRole)
         return false;
 
-    if (roleValue() == TimeRole)
+    if (roleValue() == SplitterRole)
         return false;
 
-    if (roleValue() == MarkRole)
+    if (roleValue() == TimeRole)
         return false;
 
     // if this element has aria attributes on it, it should not be ignored.