Make TextDecoration an enum class.

third_party/WebKit/Source/core/style/ComputedStyle.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, 2009, 2010, 2011 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
@@ skipping 1477 matching lines @@
   }
   void SetPageSize(const FloatSize& s) {
     SET_VAR(rare_non_inherited_data_, page_size_, s);
   }
   void SetPageSizeType(PageSizeType t) {
     SET_VAR(rare_non_inherited_data_, page_size_type_, t);
   }
 
   // Text decoration properties.
   // text-decoration-line
-  static TextDecoration InitialTextDecoration() { return kTextDecorationNone; }
+  static TextDecoration InitialTextDecoration() {
+    return TextDecoration::kNone;
+  }
   TextDecoration GetTextDecoration() const {
     return static_cast<TextDecoration>(visual_data_->text_decoration);
   }
   void SetTextDecoration(TextDecoration v) {
-    SET_VAR(visual_data_, text_decoration, v);
+    SET_VAR(visual_data_, text_decoration, static_cast<unsigned>(v));

[Bugs Nash, 2017/04/27 00:53:54]

as above, I would store this as a TextDecoration on StyleVisualData. As that one
is used in many places though happy for it to be a todo in this patch and
changed in a separate patch

[shend, 2017/04/27 01:09:17]

Same reasoning as above, we need to pack text_decoration.

   }
 
   // text-decoration-color
   void SetTextDecorationColor(const StyleColor& c) {
     SET_VAR(rare_non_inherited_data_, text_decoration_color_, c);
   }
 
   // text-decoration-style
   static TextDecorationStyle InitialTextDecorationStyle() {
     return kTextDecorationStyleSolid;
@@ skipping 2176 matching lines @@
       PseudoBitsInternal() | 1 << (pseudo - kFirstPublicPseudoId)));
 }
 
 inline bool ComputedStyle::HasPseudoElementStyle() const {
   return PseudoBitsInternal() & kElementPseudoIdMask;
 }
 
 }  // namespace blink
 
 #endif  // ComputedStyle_h