ALL-IN-ONE Introduce enum class TextAffinity

Source/core/layout/LayoutTreeAsText.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 738 matching lines @@
         return;
 
     Document* doc = toDocument(n);
     LocalFrame* frame = doc->frame();
     if (!frame)
         return;
 
     VisibleSelection selection = frame->selection().selection();
     if (selection.isCaret()) {
         ts << "caret: position " << selection.start().computeEditingOffset() << " of " << nodePositionAsStringForTesting(selection.start().anchorNode());
-        if (selection.affinity() == UPSTREAM)
+        if (selection.affinity() == TextAffinity::Upstream)
             ts << " (upstream affinity)";
         ts << "\n";
     } else if (selection.isRange()) {
         ts << "selection start: position " << selection.start().computeEditingOffset() << " of " << nodePositionAsStringForTesting(selection.start().anchorNode()) << "\n"
             << "selection end:   position " << selection.end().computeEditingOffset() << " of " << nodePositionAsStringForTesting(selection.end().anchorNode()) << "\n";
     }
 }
 
 static String externalRepresentation(LayoutBox* layoutObject, LayoutAsTextBehavior behavior)
 {
@@ skipping 72 matching lines @@
     element->document().updateLayout();
 
     LayoutObject* layoutObject = element->layoutObject();
     if (!layoutObject || !layoutObject->isListItem())
         return String();
 
     return toLayoutListItem(layoutObject)->markerText();
 }
 
 } // namespace blink