CSS Parser: Support CDO and CDC tokens (<!--, -->)

Source/core/css/parser/CSSParserToken.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CSSParserToken_h
 #define CSSParserToken_h
 
 #include "core/css/CSSPrimitiveValue.h"
 #include "wtf/text/WTFString.h"
 
@@ skipping 11 matching lines @@
     PercentageToken,
     DimensionToken,
     IncludeMatchToken,
     DashMatchToken,
     PrefixMatchToken,
     SuffixMatchToken,
     SubstringMatchToken,
     ColumnToken,
     UnicodeRangeToken,
     WhitespaceToken,
+    CDOToken,
+    CDCToken,
     ColonToken,
     SemicolonToken,
     CommaToken,
     LeftParenthesisToken,
     RightParenthesisToken,
     LeftBracketToken,
     RightBracketToken,
     LeftBraceToken,
     RightBraceToken,
     StringToken,
@@ skipping 69 matching lines @@
     CSSPrimitiveValue::UnitType m_unit;
     UChar32 m_unicodeRangeStart;
     UChar32 m_unicodeRangeEnd;
 
     BlockType m_blockType;
 };
 
 } // namespace
 
 #endif // CSSSParserToken_h