Accept 'cursor' on ::marker pseudo-elements

According to this CSSWG resolution:
w3c/csswg-drafts#6203 (comment)

Bug: 352335092
Change-Id: I5d1c2f89cabf10e397de70bd70bfbe03910a0676
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5756462
Reviewed-by: Steinar H Gunderson <sesse@chromium.org>
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Cr-Commit-Position: refs/heads/main@{#1337776}

css/css-pseudo/parsing/marker-supported-properties-in-animation.html

@@ -272,6 +272,14 @@
     midPoint: "rgb(50, 100, 100) 2px 2px 2px",
   },
 
+  // ::marker supports `cursor`.
+  {
+    property: "cursor",
+    from: "auto",
+    to: "move",
+    midPoint: "move",
+  },
+
   // ::marker does NOT support layout properties
   {
     property: "display",

css/css-pseudo/parsing/marker-supported-properties.html

@@ -88,6 +88,9 @@
 test_pseudo_computed_value("::marker", "text-emphasis-style", "dot");
 test_pseudo_computed_value("::marker", "text-shadow", "rgb(0, 255, 0) 1px 2px 3px");
 
+// ::marker supports `cursor`.
+test_pseudo_computed_value("::marker", "cursor", "move");
+
 // ::marker does NOT support layout properties
 test_pseudo_computed_value("::marker", "display", "none", ["block", "inline", "inline-block"]);
 test_pseudo_computed_value("::marker", "position", "absolute", "static");