Make EBorderStyle an enum class.

third_party/WebKit/Source/core/style/BorderValue.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * 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 23 matching lines @@
 namespace blink {
 
 class BorderValue {
   DISALLOW_NEW();
   friend class ComputedStyle;
 
  public:
   BorderValue()
       : color_(0),
         color_is_current_color_(true),
-        style_(kBorderStyleNone),
+        style_(static_cast<unsigned>(EBorderStyle::kNone)),
         is_auto_(kOutlineIsAutoOff) {
     SetWidth(3);
   }
 
   BorderValue(const BorderStyle& data, const StyleColor& color, float width) {
     SetColor(color.Resolve(Color()));
     SetStyle(data.Style());
     SetIsAuto(data.IsAuto());
     SetWidth(width);
   }
 
-  bool NonZero() const { return Width() && (style_ != kBorderStyleNone); }
+  bool NonZero() const {
+    return Width() && (style_ != static_cast<unsigned>(EBorderStyle::kNone));
+  }
 
   bool IsTransparent() const {
     return !color_is_current_color_ && !color_.Alpha();
   }
 
   bool operator==(const BorderValue& o) const {
     return width_ == o.width_ && style_ == o.style_ && color_ == o.color_ &&
            color_is_current_color_ == o.color_is_current_color_;
   }
 
   // The default width is 3px, but if the style is none we compute a value of 0
   // (in ComputedStyle itself)
   bool VisuallyEqual(const BorderValue& o) const {
-    if (style_ == kBorderStyleNone && o.style_ == kBorderStyleNone)
+    if (style_ == static_cast<unsigned>(EBorderStyle::kNone) &&
+        o.style_ == static_cast<unsigned>(EBorderStyle::kNone))
       return true;
-    if (style_ == kBorderStyleHidden && o.style_ == kBorderStyleHidden)
+    if (style_ == static_cast<unsigned>(EBorderStyle::kHidden) &&
+        o.style_ == static_cast<unsigned>(EBorderStyle::kHidden))
       return true;
     return *this == o;
   }
 
   bool operator!=(const BorderValue& o) const { return !(*this == o); }
 
   void SetColor(const StyleColor& color) {
     color_ = color.Resolve(Color());
     color_is_current_color_ = color.IsCurrentColor();
   }
 
   StyleColor GetColor() const {
     return color_is_current_color_ ? StyleColor::CurrentColor()
                                    : StyleColor(color_);
   }
 
   float Width() const {
     return static_cast<float>(width_) / kBorderWidthDenominator;
   }
   void SetWidth(float width) { width_ = WidthToFixedPoint(width); }
 
   // Since precision is lost with fixed point, comparisons also have
   // to be done in fixed point.
   bool WidthEquals(float width) const {
     return WidthToFixedPoint(width) == width_;
   }
 
   EBorderStyle Style() const { return static_cast<EBorderStyle>(style_); }
-  void SetStyle(EBorderStyle style) { style_ = style; }
+  void SetStyle(EBorderStyle style) { style_ = static_cast<unsigned>(style); }
 
   OutlineIsAuto IsAuto() const { return static_cast<OutlineIsAuto>(is_auto_); }
   void SetIsAuto(OutlineIsAuto is_auto) { is_auto_ = is_auto; }
 
   bool ColorIsCurrentColor() const { return color_is_current_color_; }
   void SetColorIsCurrentColor(bool color_is_current_color) {
     color_is_current_color_ = static_cast<unsigned>(color_is_current_color);
   }
 
  protected:
   static unsigned WidthToFixedPoint(float width) {
     DCHECK_GE(width, 0);
     return static_cast<unsigned>(std::min<float>(width, kMaxForBorderWidth) *
                                  kBorderWidthDenominator);
   }
 
   Color color_;
   unsigned color_is_current_color_ : 1;
 
   unsigned width_ : 26;  // Fixed point width
   unsigned style_ : 4;   // EBorderStyle
 
   // This is only used by OutlineValue but moved here to keep the bits packed.
   unsigned is_auto_ : 1;  // OutlineIsAuto
 };
 
 }  // namespace blink
 
 #endif  // BorderValue_h