Return table headers from the table cell level.

Source/modules/accessibility/AXTableCell.cpp

Index: Source/modules/accessibility/AXTableCell.cpp
diff --git a/Source/modules/accessibility/AXTableCell.cpp b/Source/modules/accessibility/AXTableCell.cpp
index e3f42df552b1ae166c10e2e7dd5952428fffa2b6..6c2cb62dcdd21e8b53adc75fe3a34b6b61887ee8 100644
--- a/Source/modules/accessibility/AXTableCell.cpp
+++ b/Source/modules/accessibility/AXTableCell.cpp
@@ -31,7 +31,7 @@
 
 #include "core/layout/LayoutTableCell.h"
 #include "modules/accessibility/AXObjectCacheImpl.h"
-
+#include "modules/accessibility/AXTable.h"
 
 namespace blink {
 
@@ -160,6 +160,52 @@ AccessibilityRole AXTableCell::determineAccessibilityRole()
     return scanToDecideHeaderRole();
 }
 
+void AXTableCell::rowHeadersForCell(AccessibilityChildrenVector& headers)
+{
+    AXObject* parent = parentTable();
+    if (!parent || !parent->isAXTable())
+        return;
+
+    AXTable* parentTable = toAXTable(parent);
+
+    pair<unsigned, unsigned> rowRange;
+    rowIndexRange(rowRange);
+
+    pair<unsigned, unsigned> columnRange;
+    columnIndexRange(columnRange);
+
+    for (unsigned i = 0; i < columnRange.first; i++) {
+        AXTableCell* cell = parentTable->cellForColumnAndRow(i, rowRange.first);
+        if (!cell || !cell->isTableCell() || cell == this)
+            continue;
+        if (cell->scanToDecideHeaderRole() == RowHeaderRole)
+            headers.append(cell);
+    }
+}
+
+void AXTableCell::columnHeadersForCell(AccessibilityChildrenVector& headers)
+{
+    AXObject* parent = parentTable();
+    if (!parent || !parent->isAXTable())
+        return;
+
+    AXTable* parentTable = toAXTable(parent);
+
+    pair<unsigned, unsigned> rowRange;
+    rowIndexRange(rowRange);
+
+    pair<unsigned, unsigned> columnRange;
+    columnIndexRange(columnRange);
+
+    for (unsigned i = 0; i < rowRange.first; i++) {
+        AXTableCell* cell = parentTable->cellForColumnAndRow(columnRange.first, i);
+        if (!cell || !cell->isTableCell() || headers.contains(cell) || cell == this)
+            continue;
+        if (cell->scanToDecideHeaderRole() == ColumnHeaderRole)
+            headers.append(cell);
+    }
+}
+
 void AXTableCell::rowIndexRange(pair<unsigned, unsigned>& rowRange)
 {
     if (!m_renderer || !m_renderer->isTableCell())