Make TextDecoration an enum class.

third_party/WebKit/Source/core/layout/LayoutTextCombine.cpp

 /*
  * Copyright (C) 2011 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 125 matching lines @@
   needs_font_update_ = false;
 
   if (!is_combined_)
     return;
 
   unsigned offset = 0;
   TextRun run = ConstructTextRun(OriginalFont(), this, offset, TextLength(),
                                  StyleRef(), Style()->Direction());
   FontDescription description = OriginalFont().GetFontDescription();
   float em_width = description.ComputedSize();
-  if (!(Style()->TextDecorationsInEffect() &
-        (kTextDecorationUnderline | kTextDecorationOverline)))
+  if (!EnumHasFlags(Style()->TextDecorationsInEffect(),
+                    TextDecoration::kUnderline | TextDecoration::kOverline))
     em_width *= kTextCombineMargin;
 
   // We are going to draw combined text horizontally.
   description.SetOrientation(FontOrientation::kHorizontal);
   combined_text_width_ = OriginalFont().Width(run);
 
   FontSelector* font_selector = Style()->GetFont().GetFontSelector();
 
   bool should_update_font = MutableStyleRef().SetFontDescription(
       description);  // Need to change font orientation to horizontal.
@@ skipping 27 matching lines @@
     } else {
       scale_x_ = 1.0f;
     }
   }
 
   if (should_update_font)
     Style()->GetFont().Update(font_selector);
 }
 
 }  // namespace blink