--- a/layout/style/ServoBindingList.h
+++ b/layout/style/ServoBindingList.h
@@ -65,17 +65,19 @@ SERVO_BINDING_FUNC(Servo_StyleSet_Remove
                    const mozilla::ServoStyleSheet* gecko_sheet)
 SERVO_BINDING_FUNC(Servo_StyleSet_InsertStyleSheetBefore, void,
                    RawServoStyleSetBorrowed set,
                    const mozilla::ServoStyleSheet* gecko_sheet,
                    const mozilla::ServoStyleSheet* before)
 SERVO_BINDING_FUNC(Servo_StyleSet_FlushStyleSheets, void, RawServoStyleSetBorrowed set,
                    RawGeckoElementBorrowedOrNull doc_elem)
 SERVO_BINDING_FUNC(Servo_StyleSet_NoteStyleSheetsChanged, void,
-                   RawServoStyleSetBorrowed set, bool author_style_disabled)
+                   RawServoStyleSetBorrowed set,
+                   bool author_style_disabled,
+                   mozilla::OriginFlags changed_origins)
 SERVO_BINDING_FUNC(Servo_StyleSet_GetKeyframesForName, bool,
                    RawServoStyleSetBorrowed set,
                    const nsACString* property,
                    nsTimingFunctionBorrowed timing_function,
                    RawGeckoKeyframeListBorrowedMut keyframe_list)
 SERVO_BINDING_FUNC(Servo_StyleSet_GetFontFaceRules, void,
                    RawServoStyleSetBorrowed set,
                    RawGeckoFontFaceRuleListBorrowedMut list)

--- a/layout/style/ServoBindingTypes.h
+++ b/layout/style/ServoBindingTypes.h
@@ -31,16 +31,17 @@ namespace dom {
 class Element;
 class StyleChildrenIterator;
 } // namespace dom
 struct AnimationPropertySegment;
 struct ComputedTiming;
 struct Keyframe;
 struct PropertyValuePair;
 struct PropertyStyleAnimationValuePair;
+enum class OriginFlags : uint8_t;
 using ComputedKeyframeValues = nsTArray<PropertyStyleAnimationValuePair>;
 } // namespace mozilla
 namespace nsStyleTransformMatrix {
 enum class MatrixTransformOperator: uint8_t;
 }
 
 class nsCSSPropertyIDSet;
 class nsCSSValue;

--- a/layout/style/ServoBindings.toml
+++ b/layout/style/ServoBindings.toml
@@ -85,16 +85,17 @@ raw-lines = [
 hide-types = [
     "nsString",
     ".*char_traits",
     ".*incompatible_char_type",
 ]
 bitfield-enums = [
     "nsChangeHint",
     "nsRestyleHint",
+    "OriginFlags",
 ]
 constified-enums = [
     "UpdateAnimationsTasks",
     "ParsingMode",
     "ThemeWidgetType",
     "ServoTraversalFlags",
 ]
 constified-enum-variants = [
@@ -132,16 +133,17 @@ whitelist-types = [
     "mozilla::css::ErrorReporter",
     "mozilla::css::LoaderReusableStyleSheets",
     "mozilla::css::SheetParsingMode",
     "mozilla::css::URLMatchingFunction",
     "mozilla::dom::IterationCompositeOperation",
     "mozilla::dom::StyleChildrenIterator",
     "mozilla::HalfCorner",
     "mozilla::MallocSizeOf",
+    "mozilla::OriginFlags",
     "mozilla::PropertyStyleAnimationValuePair",
     "mozilla::ServoTraversalFlags",
     "mozilla::StylePrefs",
     "mozilla::StyleShapeRadius",
     "mozilla::StyleGrid.*",
     "mozilla::UpdateAnimationsTasks",
     "mozilla::LookAndFeel",
     "mozilla::gfx::Float",
@@ -362,16 +364,17 @@ raw-lines = [
 whitelist-functions = ["Servo_.*", "Gecko_.*"]
 structs-types = [
     "mozilla::css::GridTemplateAreasValue",
     "mozilla::css::ErrorReporter",
     "mozilla::css::ImageValue",
     "mozilla::css::URLValue",
     "mozilla::css::URLValueData",
     "mozilla::MallocSizeOf",
+    "mozilla::OriginFlags",
     "mozilla::Side",
     "mozilla::UniquePtr",
     "nsIContent",
     "nsIDocument",
     "nsIDocument_DocumentTheme",
     "RawGeckoAnimationPropertySegment",
     "RawGeckoComputedTiming",
     "RawGeckoCSSPropertyIDList",

--- a/layout/style/ServoStyleSet.cpp
+++ b/layout/style/ServoStyleSet.cpp
@@ -1031,17 +1031,19 @@ ServoStyleSet::StyleSubtreeForReconstruc
     MOZ_ASSERT(!postTraversalRequired);
   }
 }
 
 void
 ServoStyleSet::ForceAllStyleDirty()
 {
   SetStylistStyleSheetsDirty();
-  Servo_StyleSet_NoteStyleSheetsChanged(mRawSet.get(), mAuthorStyleDisabled);
+  Servo_StyleSet_NoteStyleSheetsChanged(mRawSet.get(),
+                                        mAuthorStyleDisabled,
+                                        OriginFlags::All);
 }
 
 void
 ServoStyleSet::RecordStyleSheetChange(
     ServoStyleSheet* aSheet,
     StyleSheet::ChangeType aChangeType)
 {
   SetStylistStyleSheetsDirty();

--- a/layout/style/ServoStyleSet.h
+++ b/layout/style/ServoStyleSet.h
@@ -53,16 +53,26 @@ namespace mozilla {
 enum class StylistState : uint8_t {
   /** The stylist is not dirty, we should do nothing */
   NotDirty = 0,
 
   /** The style sheets have changed, so we need to update the style data. */
   StyleSheetsDirty,
 };
 
+// Bitfield type to represent Servo stylesheet origins.
+enum class OriginFlags : uint8_t {
+  UserAgent = 0x01,
+  User      = 0x02,
+  Author    = 0x04,
+  All       = 0x07,
+};
+
+MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(OriginFlags)
+
 /**
  * The set of style sheets that apply to a document, backed by a Servo
  * Stylist.  A ServoStyleSet contains ServoStyleSheets.
  */
 class ServoStyleSet
 {
   friend class ServoRestyleManager;
   typedef ServoElementSnapshotTable SnapshotTable;