Aria table row and column headers are not exposed in accessibility

Source/modules/accessibility/AXARIAGridCell.h

Index: Source/modules/accessibility/AXARIAGridCell.h
diff --git a/Source/modules/accessibility/AXARIAGridCell.h b/Source/modules/accessibility/AXARIAGridCell.h
index ea34164f323a3212cd62866652ea667f26711747..03f2402d55a5e11dc9714ac6bfee2ff687badc3a 100644
--- a/Source/modules/accessibility/AXARIAGridCell.h
+++ b/Source/modules/accessibility/AXARIAGridCell.h
@@ -48,8 +48,11 @@ public:
     virtual void rowIndexRange(pair<unsigned, unsigned>& rowRange) override;
     // fills in the start location and column span of cell
     virtual void columnIndexRange(pair<unsigned, unsigned>& columnRange) override;
+    virtual AccessibilityRole scanToDecideHeaderRole() override;
 
 protected:
+    bool isAriaColumnHeader() const;
+    bool isAriaRowHeader() const;
     virtual AXObject* parentTable() const override;
 };