Make TextUnderlinePosition an enum class.

third_party/WebKit/Source/core/paint/TextPainterBase.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/TextPainterBase.h"
 
 #include "core/dom/Document.h"
 #include "core/paint/AppliedDecorationPainter.h"
 #include "core/paint/BoxPainter.h"
 #include "core/paint/PaintInfo.h"
@@ skipping 181 matching lines @@
 static ResolvedUnderlinePosition ResolveUnderlinePosition(
     const ComputedStyle& style,
     FontBaseline baseline_type) {
   // |auto| should resolve to |under| to avoid drawing through glyphs in
   // scripts where it would not be appropriate (e.g., ideographs.)
   // However, this has performance implications. For now, we only work with
   // vertical text.
   switch (baseline_type) {
     case kAlphabeticBaseline:
       switch (style.GetTextUnderlinePosition()) {
-        case kTextUnderlinePositionAuto:
+        case TextUnderlinePosition::kAuto:
           return ResolvedUnderlinePosition::kRoman;
-        case kTextUnderlinePositionUnder:
+        case TextUnderlinePosition::kUnder:
           return ResolvedUnderlinePosition::kUnder;
       }
       break;
     case kIdeographicBaseline:
       // Compute language-appropriate default underline position.
       // https://drafts.csswg.org/css-text-decor-3/#default-stylesheet
       UScriptCode script = style.GetFontDescription().GetScript();
       if (script == USCRIPT_KATAKANA_OR_HIRAGANA || script == USCRIPT_HANGUL)
         return ResolvedUnderlinePosition::kOver;
       return ResolvedUnderlinePosition::kUnder;
@@ skipping 74 matching lines @@
       decoration_info.thickness = ComputeDecorationThickness(
           decoration_info.style, decoration_info.font_data);
     }
   }
 
   // Offset between lines - always non-zero, so lines never cross each other.
   decoration_info.double_offset = decoration_info.thickness + 1.f;
 }
 
 }  // namespace blink