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

Source/modules/accessibility/AXLayoutObject.h

 /*
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 177 matching lines @@
     virtual void textChanged() override;
 
     // Text metrics. Most of these should be deprecated, needs major cleanup.
     virtual int index(const VisiblePosition&) const override;
     virtual VisiblePosition visiblePositionForIndex(int) const override;
     virtual void lineBreaks(Vector<int>&) const override;
 
 private:
     bool isAllowedChildOfTree() const;
     void ariaListboxSelectedChildren(AccessibilityChildrenVector&);
-    PlainTextRange ariaSelectedTextRange() const;
+    PlainTextRange visibleSelectionUnderObject() const;
     bool nodeIsTextControl(const Node*) const;
     bool isTabItemSelected() const;
     AXObject* accessibilityImageMapHitTest(HTMLAreaElement*, const IntPoint&) const;
     LayoutObject* layoutParentObject() const;
     bool isSVGImage() const;
     void detachRemoteSVGRoot();
     AXSVGRoot* remoteSVGRootElement() const;
     AXObject* remoteSVGElementHitTest(const IntPoint&) const;
     void offsetBoundingBoxForRemoteSVGElement(LayoutRect&) const;
     void addHiddenChildren();
@@ skipping 11 matching lines @@
     VisibleSelection selection() const;
     int indexForVisiblePosition(const VisiblePosition&) const;
     void accessibilityChildrenFromAttribute(QualifiedName attr, AccessibilityChildrenVector&) const;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXLayoutObject, isAXLayoutObject());
 
 } // namespace blink
 
 #endif // AXLayoutObject_h