Add keyword_subset field template and generate text-decoration-line.

third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h

 /*
  * Copyright (C) 2007 Alexey Proskuryakov <ap@nypop.com>.
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 640 matching lines @@
       return ETableLayout::kAuto;
     default:
       break;
   }
 
   NOTREACHED();
   return ETableLayout::kAuto;
 }
 
 template <>
-inline TextDecoration CSSIdentifierValue::ConvertTo() const {
-  switch (value_id_) {
-    case CSSValueNone:
-      return TextDecoration::kNone;
-    case CSSValueUnderline:
-      return TextDecoration::kUnderline;
-    case CSSValueOverline:
-      return TextDecoration::kOverline;
-    case CSSValueLineThrough:
-      return TextDecoration::kLineThrough;
-    case CSSValueBlink:
-      return TextDecoration::kBlink;
-    default:
-      break;
-  }
-
-  NOTREACHED();
-  return TextDecoration::kNone;
-}
-
-template <>
 inline TextDecorationSkip CSSIdentifierValue::ConvertTo() const {
   switch (value_id_) {
     case CSSValueObjects:
       return TextDecorationSkip::kObjects;
     case CSSValueInk:
       return TextDecorationSkip::kInk;
     default:
       break;
   }
 
@@ skipping 1505 matching lines @@
     default:
       break;
   }
   NOTREACHED();
   return kContainsNone;
 }
 
 }  // namespace blink
 
 #endif