List marker pseudo elements.

Source/core/style/ComputedStyleConstants.h

Index: Source/core/style/ComputedStyleConstants.h
diff --git a/Source/core/style/ComputedStyleConstants.h b/Source/core/style/ComputedStyleConstants.h
index 0aa2718fe8c850a9849f26484482ea37299a1542..69ce0391c06ae167f43c769e8bdb63e1a1634b25 100644
--- a/Source/core/style/ComputedStyleConstants.h
+++ b/Source/core/style/ComputedStyleConstants.h
@@ -56,7 +56,7 @@ enum PrintColorAdjust {
 enum PseudoId {
     // The order must be NOP ID, public IDs, and then internal IDs.
     // If you add or remove a public ID, you must update _pseudoBits in ComputedStyle.
-    NOPSEUDO, FIRST_LINE, FIRST_LETTER, BEFORE, AFTER, BACKDROP, SELECTION, FIRST_LINE_INHERITED, SCROLLBAR,
+    NOPSEUDO, FIRST_LINE, FIRST_LETTER, BEFORE, AFTER, BACKDROP, SELECTION, FIRST_LINE_INHERITED, SCROLLBAR, MARKER,
     // Internal IDs follow:
     SCROLLBAR_THUMB, SCROLLBAR_BUTTON, SCROLLBAR_TRACK, SCROLLBAR_TRACK_PIECE, SCROLLBAR_CORNER, RESIZER, INPUT_LIST_BUTTON,
     // Special values follow: