List marker pseudo elements.

Source/core/rendering/style/RenderStyleConstants.h

Index: Source/core/rendering/style/RenderStyleConstants.h
diff --git a/Source/core/rendering/style/RenderStyleConstants.h b/Source/core/rendering/style/RenderStyleConstants.h
index f9768485ad3f932ced34faba45934dcb7cb15699..a1c5eb67d2da9a5700720fc226e3d9c6bef79f61 100644
--- a/Source/core/rendering/style/RenderStyleConstants.h
+++ b/Source/core/rendering/style/RenderStyleConstants.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 RenderStyle.
-    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: