--- a/servo/ports/geckolib/glue.rs
+++ b/servo/ports/geckolib/glue.rs
@@ -70,16 +70,19 @@ use style::gecko_bindings::structs;
 use style::gecko_bindings::structs::{CSSPseudoElementType, CompositeOperation, Loader};
 use style::gecko_bindings::structs::{RawServoStyleRule, ServoStyleContextStrong};
 use style::gecko_bindings::structs::{ServoStyleSheet, SheetParsingMode, nsIAtom, nsCSSPropertyID};
 use style::gecko_bindings::structs::{nsCSSFontFaceRule, nsCSSCounterStyleRule};
 use style::gecko_bindings::structs::{nsRestyleHint, nsChangeHint, PropertyValuePair};
 use style::gecko_bindings::structs::IterationCompositeOperation;
 use style::gecko_bindings::structs::MallocSizeOf;
 use style::gecko_bindings::structs::OriginFlags;
+use style::gecko_bindings::structs::OriginFlags_Author;
+use style::gecko_bindings::structs::OriginFlags_User;
+use style::gecko_bindings::structs::OriginFlags_UserAgent;
 use style::gecko_bindings::structs::RawGeckoGfxMatrix4x4;
 use style::gecko_bindings::structs::RawGeckoPresContextOwned;
 use style::gecko_bindings::structs::SeenPtrs;
 use style::gecko_bindings::structs::ServoElementSnapshotTable;
 use style::gecko_bindings::structs::ServoTraversalFlags;
 use style::gecko_bindings::structs::StyleRuleInclusion;
 use style::gecko_bindings::structs::URLExtraData;
 use style::gecko_bindings::structs::nsCSSValueSharedList;
@@ -1007,16 +1010,27 @@ pub extern "C" fn Servo_StyleSheet_SizeO
 ) -> usize {
     let global_style_data = &*GLOBAL_STYLE_DATA;
     let guard = global_style_data.shared_lock.read();
     let malloc_size_of = malloc_size_of.unwrap();
     StylesheetContents::as_arc(&sheet)
         .malloc_size_of_children(&guard, malloc_size_of)
 }
 
+#[no_mangle]
+pub extern "C" fn Servo_StyleSheet_GetOrigin(
+    sheet: RawServoStyleSheetContentsBorrowed
+) -> OriginFlags {
+    match StylesheetContents::as_arc(&sheet).origin {
+        Origin::UserAgent => OriginFlags_UserAgent,
+        Origin::User => OriginFlags_User,
+        Origin::Author => OriginFlags_Author,
+    }
+}
+
 fn read_locked_arc<T, R, F>(raw: &<Locked<T> as HasFFI>::FFIType, func: F) -> R
     where Locked<T>: HasArcFFI, F: FnOnce(&T) -> R
 {
     let global_style_data = &*GLOBAL_STYLE_DATA;
     let guard = global_style_data.shared_lock.read();
     func(Locked::<T>::as_arc(&raw).read_with(&guard))
 }