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

Source/modules/accessibility/AXNodeObject.cpp

 /*
 * Copyright (C) 2012, Google 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 493 matching lines @@
     idList.replace('\n', ' ');
     Vector<String> idVector;
     idList.split(' ', idVector);
 
     for (const auto& idName : idVector) {
         if (Element* idElement = scope.getElementById(AtomicString(idName)))
             elements.append(idElement);
     }
 }
 
-// If you call node->hasEditableStyle() since that will return true if an ancestor is editable.
-// This only returns true if this is the element that actually has the contentEditable attribute set.
+// This only returns true if this is the element that actually has the
+// contentEditable attribute set, unlike node->hasEditableStyle() which will
+// also return true if an ancestor is editable.
 bool AXNodeObject::hasContentEditableAttributeSet() const
 {
     if (!hasAttribute(contenteditableAttr))
         return false;
     const AtomicString& contentEditableValue = getAttribute(contenteditableAttr);
     // Both "true" (case-insensitive) and the empty string count as true.
     return contentEditableValue.isEmpty() || equalIgnoringCase(contentEditableValue, "true");
 }
 
+bool AXNodeObject::isTextControl() const
+{
+    if (hasContentEditableAttributeSet())
+        return true;
+
+    switch (roleValue()) {
+    case TextFieldRole:
+    case ComboBoxRole:
+    case SearchBoxRole:
+        return true;
+    default:
+        return false;
+    }
+}
+
 bool AXNodeObject::isGenericFocusableElement() const
 {
     if (!canSetFocusAttribute())
         return false;
 
     // If it's a control, it's not generic.
     if (isControl())
         return false;
 
     // If it has an aria role, it's not generic.
@@ skipping 1627 matching lines @@
         ariaLabeledByElements(elements);
 
         for (const auto& element : elements) {
             RefPtr<AXObject> axElement = axObjectCache()->getOrCreate(element);
             textOrder.append(AccessibilityText(ariaLabeledBy, AlternativeText, axElement));
         }
     }
 }
 
 } // namespace blink