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

Source/core/css/parser/CSSTokenizer.cpp

Index: Source/core/css/parser/CSSTokenizer.cpp
diff --git a/Source/core/css/parser/CSSTokenizer.cpp b/Source/core/css/parser/CSSTokenizer.cpp
index a36a047b5e051c69a379220dfbf17086faf9d0db..2245ffe677efda98864da882d71118d6a7568e20 100644
--- a/Source/core/css/parser/CSSTokenizer.cpp
+++ b/Source/core/css/parser/CSSTokenizer.cpp
@@ -148,6 +148,16 @@ CSSParserToken CSSTokenizer::asterisk(UChar cc)
     return CSSParserToken(DelimiterToken, '*');
 }
 
+CSSParserToken CSSTokenizer::lessThan(UChar cc)
+{
+    ASSERT(cc == '<');
+    if (m_input.peek(0) == '!' && m_input.peek(1) == '-' && m_input.peek(2) == '-') {
+        consume(3);
+        return CSSParserToken(CDOToken);
+    }
+    return CSSParserToken(DelimiterToken, '<');
+}
+
 CSSParserToken CSSTokenizer::comma(UChar cc)
 {
     return CSSParserToken(CommaToken);
@@ -159,6 +169,10 @@ CSSParserToken CSSTokenizer::hyphenMinus(UChar cc)
         reconsume(cc);
         return consumeNumericToken();
     }
+    if (m_input.peek(0) == '-' && m_input.peek(1) == '>') {
+        consume(2);
+        return CSSParserToken(CDCToken);
+    }
     if (nextCharsAreIdentifier(cc)) {
         reconsume(cc);
         return consumeIdentLikeToken();