List marker pseudo elements.

Source/core/css/CSSSelector.cpp

Index: Source/core/css/CSSSelector.cpp
diff --git a/Source/core/css/CSSSelector.cpp b/Source/core/css/CSSSelector.cpp
index 8490daf8cf6288f75e0cca5753b3771b421f00fe..fabbbc9adb01b6fc83fd6d8144cdd9c077cf16b6 100644
--- a/Source/core/css/CSSSelector.cpp
+++ b/Source/core/css/CSSSelector.cpp
@@ -174,6 +174,8 @@ PseudoId CSSSelector::pseudoId(PseudoType type)
         return AFTER;
     case PseudoBackdrop:
         return BACKDROP;
+    case PseudoMarker:
+        return MARKER;
     case PseudoScrollbar:
         return SCROLLBAR;
     case PseudoScrollbarButton:
@@ -327,6 +329,7 @@ const static NameToPseudoStruct pseudoTypeWithoutArgumentsMap[] = {
 {"last-of-type",                  CSSSelector::PseudoLastOfType},
 {"left",                          CSSSelector::PseudoLeftPage},
 {"link",                          CSSSelector::PseudoLink},
+{"marker",                        CSSSelector::PseudoMarker},
 {"no-button",                     CSSSelector::PseudoNoButton},
 {"only-child",                    CSSSelector::PseudoOnlyChild},
 {"only-of-type",                  CSSSelector::PseudoOnlyOfType},
@@ -465,6 +468,7 @@ void CSSSelector::extractPseudoType() const
         compat = true;
     case PseudoBackdrop:
     case PseudoCue:
+    case PseudoMarker:
     case PseudoResizer:
     case PseudoScrollbar:
     case PseudoScrollbarCorner: