Reland TableCaptionElement is not exposed to accessibility

Source/modules/accessibility/AXTable.cpp

Index: Source/modules/accessibility/AXTable.cpp
diff --git a/Source/modules/accessibility/AXTable.cpp b/Source/modules/accessibility/AXTable.cpp
index 1f87ce1d1be1cef0b3e34fbf833eda90d77a7741..1d75f2a06fc3f7e6bdeab171aac1e4cc8762f8f8 100644
--- a/Source/modules/accessibility/AXTable.cpp
+++ b/Source/modules/accessibility/AXTable.cpp
@@ -373,6 +373,15 @@ void AXTable::addChildren()
     RenderTable* table = toRenderTable(m_renderer);
     AXObjectCacheImpl* axCache = axObjectCache();
 
+    // Add caption
+    if (HTMLTableElement* tableElement = toHTMLTableElement(table->node())) {
+        if (HTMLTableCaptionElement* caption = tableElement->caption()) {
+            AXObject* captionObject = axCache->getOrCreate(caption);
+            if (!captionObject->accessibilityIsIgnored())
+                m_children.append(captionObject);
+        }
+    }
+
     // Go through all the available sections to pull out the rows and add them as children.
     table->recalcSectionsIfNeeded();
     RenderTableSection* tableSection = table->topSection();