Make TextDecoration an enum class.

third_party/WebKit/Source/core/layout/line/InlineFlowBox.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc.
  *               All rights reserved.
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 891 matching lines @@
     LineLayoutItem decorating_box,
     LineVerticalPositionType position_type,
     FontBaseline baseline_type,
     LayoutUnit farthest) const {
   for (InlineBox* curr = FirstChild(); curr; curr = curr->NextOnLine()) {
     if (curr->GetLineLayoutItem().IsOutOfFlowPositioned())
       continue;  // Positioned placeholders don't affect calculations.
 
     // If the text decoration isn't in effect on the child, it must be outside
     // of |decorationObject|.
-    if (!(curr->LineStyleRef().TextDecorationsInEffect() &
-          kTextDecorationUnderline))
+    if (!EnumHasFlags(curr->LineStyleRef().TextDecorationsInEffect(),
+                      TextDecoration::kUnderline))
       continue;
 
     if (decorating_box && decorating_box.IsLayoutInline() &&
         !IsAncestorAndWithinBlock(decorating_box, curr->GetLineLayoutItem()))
       continue;
 
     if (curr->IsInlineFlowBox()) {
       farthest = ToInlineFlowBox(curr)->FarthestPositionForUnderline(
           decorating_box, position_type, baseline_type, farthest);
     } else if (curr->IsInlineTextBox()) {
@@ skipping 807 matching lines @@
     DCHECK_EQ(child->prevOnLine(), prev);
     prev = child;
   }
   DCHECK_EQ(prev, m_lastChild);
 #endif
 }
 
 #endif
 
 }  // namespace blink