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

Source/core/css/parser/CSSParserValues.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008 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,
@@ skipping 164 matching lines @@
             value.setFromOperator('{');
             break;
         case RightBraceToken:
             value.setFromOperator('}');
             break;
         case WhitespaceToken:
         case CommentToken:
             continue;
         case EOFToken:
             ASSERT_NOT_REACHED();
+        case CDOToken:
+        case CDCToken:
         case AtKeywordToken:
         case IncludeMatchToken:
         case DashMatchToken:
         case PrefixMatchToken:
         case SuffixMatchToken:
         case SubstringMatchToken:
         case ColumnToken:
         case BadStringToken:
         case BadUrlToken:
         case ColonToken:
@@ skipping 142 matching lines @@
 bool CSSParserSelector::hasHostPseudoSelector() const
 {
     for (CSSParserSelector* selector = const_cast<CSSParserSelector*>(this); selector; selector = selector->tagHistory()) {
         if (selector->pseudoType() == CSSSelector::PseudoHost || selector->pseudoType() == CSSSelector::PseudoHostContext)
             return true;
     }
     return false;
 }
 
 } // namespace blink