Make TextDecorationSkip an enum class.

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

Index: third_party/WebKit/Source/core/style/ComputedStyleConstants.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyleConstants.h b/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
index a817d9ae3b0dba345c70e7b4260985ce3a309867..fa822216f54da9694eadca80577033d9a4e4da47 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
@@ -238,11 +238,12 @@ enum TextDecorationStyle {
 };
 
 static const size_t kTextDecorationSkipBits = 3;
-enum TextDecorationSkip {
-  kTextDecorationSkipNone = 0x0,
-  kTextDecorationSkipObjects = 0x1,
-  kTextDecorationSkipInk = 0x2
-};
+enum class TextDecorationSkip { kNone = 0x0, kObjects = 0x1, kInk = 0x2 };
+inline TextDecorationSkip operator&(TextDecorationSkip a,
+                                    TextDecorationSkip b) {
+  return TextDecorationSkip(static_cast<unsigned>(a) &
+                            static_cast<unsigned>(b));
+}
 inline TextDecorationSkip operator|(TextDecorationSkip a,
                                     TextDecorationSkip b) {
   return TextDecorationSkip(static_cast<unsigned>(a) |