Introduce enum class TextAffinity as replacement of enum EAffinity

Source/core/layout/LayoutText.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 475 matching lines @@
     }
 
     // box is first on line
     // and the x coordinate is to the left of the first text box left edge
     if (!box->prevLeafChildIgnoringLineBreak() && pointLineDirection < box->logicalLeft())
         return true;
 
     if (!box->nextLeafChildIgnoringLineBreak()) {
         // box is last on line
         // and the x coordinate is to the right of the last text box right edge
-        // generate VisiblePosition, use UPSTREAM affinity if possible
+        // generate VisiblePosition, use TextAffinity::Upstream affinity if possible
         shouldAffinityBeDownstream = UpstreamIfPositionIsNotAtStart;
         return true;
     }
 
     return false;
 }
 
 static PositionWithAffinity createPositionWithAffinityForBox(const InlineBox* box, int offset, ShouldAffinityBeDownstream shouldAffinityBeDownstream)
 {
-    EAffinity affinity = VP_DEFAULT_AFFINITY;
+    TextAffinity affinity = VP_DEFAULT_AFFINITY;
     switch (shouldAffinityBeDownstream) {
     case AlwaysDownstream:
-        affinity = DOWNSTREAM;
+        affinity = TextAffinity::Downstream;
         break;
     case AlwaysUpstream:
         affinity = VP_UPSTREAM_IF_POSSIBLE;
         break;
     case UpstreamIfPositionIsNotAtStart:
-        affinity = offset > box->caretMinOffset() ? VP_UPSTREAM_IF_POSSIBLE : DOWNSTREAM;
+        affinity = offset > box->caretMinOffset() ? VP_UPSTREAM_IF_POSSIBLE : TextAffinity::Downstream;
         break;
     }
     int textStartOffset = box->layoutObject().isText() ? toLayoutText(box->layoutObject()).textStartOffset() : 0;
     return box->layoutObject().createPositionWithAffinity(offset + textStartOffset, affinity);
 }
 
 static PositionWithAffinity createPositionWithAffinityForBoxAfterAdjustingOffsetForBiDi(const InlineTextBox* box, int offset, ShouldAffinityBeDownstream shouldAffinityBeDownstream)
 {
     ASSERT(box);
     ASSERT(offset >= 0);
@@ skipping 1350 matching lines @@
     for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) {
         paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*box);
         if (box->truncation() != cNoTruncation) {
             if (EllipsisBox* ellipsisBox = box->root().ellipsisBox())
                 paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*ellipsisBox);
         }
     }
 }
 
 } // namespace blink