Aria table row and column headers are not exposed in accessibility

Source/modules/accessibility/AXARIAGridCell.cpp

Index: Source/modules/accessibility/AXARIAGridCell.cpp
diff --git a/Source/modules/accessibility/AXARIAGridCell.cpp b/Source/modules/accessibility/AXARIAGridCell.cpp
index b17b3c4069f1f47b61178b955a7874b8f00566d6..680fb94916c73814583b48717bbe53a0f704efb5 100644
--- a/Source/modules/accessibility/AXARIAGridCell.cpp
+++ b/Source/modules/accessibility/AXARIAGridCell.cpp
@@ -50,6 +50,18 @@ PassRefPtr<AXARIAGridCell> AXARIAGridCell::create(RenderObject* renderer, AXObje
     return adoptRef(new AXARIAGridCell(renderer, axObjectCache));
 }
 
+bool AXARIAGridCell::isAriaColumnHeader() const
+{
+    const AtomicString& role = getAttribute(HTMLNames::roleAttr);
+    return equalIgnoringCase(role, "columnheader");
+}
+
+bool AXARIAGridCell::isAriaRowHeader() const
+{
+    const AtomicString& role = getAttribute(HTMLNames::roleAttr);
+    return equalIgnoringCase(role, "rowheader");
+}
+
 AXObject* AXARIAGridCell::parentTable() const
 {
     AXObject* parent = parentObjectUnignored();
@@ -121,4 +133,15 @@ void AXARIAGridCell::columnIndexRange(pair<unsigned, unsigned>& columnRange)
     columnRange.second = 1;
 }
 
+AccessibilityRole AXARIAGridCell::scanToDecideHeaderRole()
+{
+    if (isAriaRowHeader())
+        return RowHeaderRole;
+
+    if (isAriaColumnHeader())
+        return ColumnHeaderRole;
+
+    return CellRole;
+}
+
 } // namespace blink