1 files changed, 25 insertions, 0 deletions
diff --git a/components/script/dom/bindings/codegen/parser/legacy-unenumerable-named-properties.patch b/components/script/dom/bindings/codegen/parser/legacy-unenumerable-named-properties.patch
new file mode 100644
index 00000000000..3472d054940
--- /dev/null
+++ b/components/script/dom/bindings/codegen/parser/legacy-unenumerable-named-properties.patch
@@ -0,0 +1,25 @@
+--- WebIDL.py
++++ WebIDL.py
+@@ -1069,6 +1069,12 @@ class IDLInterface(IDLObjectWithScope, IDLExposureMixins):
+
+             specialMembersSeen[memberType] = member
+
++        if (self.getExtendedAttribute("LegacyUnenumerableNamedProperties") and
++            "named getters" not in specialMembersSeen):
++            raise WebIDLError("[LegacyUnenumerableNamedProperties] used on an interface "
++                              "without a named getter",
++                              [self.location])
++
+         if self._isOnGlobalProtoChain:
+             # Make sure we have no named setters, creators, or deleters
+             for memberType in ["setter", "creator", "deleter"]:
+@@ -1417,7 +1423,8 @@ class IDLInterface(IDLObjectWithScope, IDLExposureMixins):
+                   identifier == "UnsafeInPrerendering" or
+                   identifier == "LegacyEventInit" or
+                   identifier == "ProbablyShortLivingObject" or
+-                  identifier == "Abstract"):
++                  identifier == "Abstract" or
++                  identifier == "LegacyUnenumerableNamedProperties"):
+                 # Known extended attributes that do not take values
+                 if not attr.noArguments():
+                     raise WebIDLError("[%s] must take no arguments" % identifier,