Reland: Made content editables report the caret and text selection by treating them as text controls

Source/modules/accessibility/AXLayoutObject.cpp

Index: Source/modules/accessibility/AXLayoutObject.cpp
diff --git a/Source/modules/accessibility/AXLayoutObject.cpp b/Source/modules/accessibility/AXLayoutObject.cpp
index 2ab02db3219a7c318e16aed70064c4d694014b1b..63fab1453eefd010b27d9a6142c16ece85137359 100644
--- a/Source/modules/accessibility/AXLayoutObject.cpp
+++ b/Source/modules/accessibility/AXLayoutObject.cpp
@@ -1848,7 +1848,9 @@ int AXLayoutObject::indexForVisiblePosition(const VisiblePosition& pos) const
         return 0;
 
     Position indexPosition = pos.deepEquivalent();
-    if (indexPosition.isNull() || highestEditableRoot(indexPosition, HasEditableAXRole) != node)
+    if (indexPosition.isNull()
+        || highestEditableRoot(indexPosition) != node
+        && highestEditableRoot(indexPosition, HasEditableAXRole) != node)
         return 0;
 
     RefPtrWillBeRawPtr<Range> range = Range::create(m_layoutObject->document());