Introduce enum class TextAffinity as replacement of enum EAffinity

Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 18 matching lines @@
 
 #include "core/HTMLNames.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/AXObjectCache.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/StyleEngine.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/editing/EditingBoundary.h"
 #include "core/editing/EditingUtilities.h"
 #include "core/editing/FrameSelection.h"
+#include "core/editing/TextAffinity.h"
 #include "core/fetch/ResourceLoadPriorityOptimizer.h"
 #include "core/fetch/ResourceLoader.h"
 #include "core/frame/DeprecatedScheduleStyleRecalcDuringLayout.h"
 #include "core/frame/EventHandlerRegistry.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/frame/UseCounter.h"
 #include "core/html/HTMLAnchorElement.h"
 #include "core/html/HTMLElement.h"
@@ skipping 2928 matching lines @@
             break;
 
         // Webkit specific extension where offsetParent stops at zoom level changes.
         if (effectiveZoom != ancestor->style()->effectiveZoom())
             break;
     }
 
     return node && node->isElementNode() ? toElement(node) : nullptr;
 }
 
-PositionWithAffinity LayoutObject::createPositionWithAffinity(int offset, EAffinity affinity)
+PositionWithAffinity LayoutObject::createPositionWithAffinity(int offset, TextAffinity affinity)
 {
     // If this is a non-anonymous layoutObject in an editable area, then it's simple.
     if (Node* node = nonPseudoNode()) {
         if (!node->hasEditableStyle()) {
             // If it can be found, we prefer a visually equivalent position that is editable.
             const Position position = Position(node, offset);
             Position candidate = position.downstream(CanCrossEditingBoundary);
             if (candidate.anchorNode()->hasEditableStyle())
                 return PositionWithAffinity(candidate, affinity);
             candidate = position.upstream(CanCrossEditingBoundary);
@@ skipping 33 matching lines @@
         // Repeat at the next level up.
         child = parent;
     }
 
     // Everything was anonymous. Give up.
     return PositionWithAffinity();
 }
 
 PositionWithAffinity LayoutObject::createPositionWithAffinity(int offset)
 {
-    return createPositionWithAffinity(offset, DOWNSTREAM);
+    return createPositionWithAffinity(offset, TextAffinity::Downstream);
 }
 
 PositionWithAffinity LayoutObject::createPositionWithAffinity(const Position& position)
 {
     if (position.isNotNull())
         return PositionWithAffinity(position);
 
     ASSERT(!node());
     return createPositionWithAffinity(0);
 }
@@ skipping 350 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         fprintf(stderr, "Cannot showLayoutTree. Root is (nil)\n");
     }
 }
 
 #endif