Gecko sync update

Author: moz-wptsync-bot

css/css-borders/tentative/border-shape/META.yml

@@ -0,0 +1,5 @@
+links:
+- product: firefox
+  results:
+  - test: border-shape-overflow-solid-background.html
+  url: https://bugzilla.mozilla.org/show_bug.cgi?id=2003761