Return table headers for aria tables.

Source/modules/accessibility/AXARIAGridRow.cpp

Index: Source/modules/accessibility/AXARIAGridRow.cpp
diff --git a/Source/modules/accessibility/AXARIAGridRow.cpp b/Source/modules/accessibility/AXARIAGridRow.cpp
index fa6dba1e5a02ec58d8fc0183a570035e30d1f987..957bd91741072d95c970b584bcbbc69cf4b955cc 100644
--- a/Source/modules/accessibility/AXARIAGridRow.cpp
+++ b/Source/modules/accessibility/AXARIAGridRow.cpp
@@ -71,4 +71,15 @@ AXObject* AXARIAGridRow::headerObject()
     return 0;
 }
 
+void AXARIAGridRow::headerObjectsForRow(AccessibilityChildrenVector& headers)
+{
+    AccessibilityChildrenVector rowChildren = children();
+    unsigned childrenCount = rowChildren.size();
+    for (unsigned i = 0; i < childrenCount; i++) {
+        AXObject* cell = rowChildren[i].get();
+        if (cell->roleValue() == RowHeaderRole)
+            headers.append(cell);
+    }
+}
+
 } // namespace blink