1 files changed, 3 insertions, 1 deletions
diff --git a/gfx/layers/FrameMetrics.h b/gfx/layers/FrameMetrics.h
index 5d13d36703..c79a088e53 100644
--- a/gfx/layers/FrameMetrics.h
+++ b/gfx/layers/FrameMetrics.h
@@ -700,7 +700,7 @@ MOZ_DEFINE_ENUM_CLASS_WITH_BASE(
 std::ostream& operator<<(std::ostream& aStream,
                          const OverscrollBehavior& aBehavior);
 
-struct OverscrollBehaviorInfo {
+struct OverscrollBehaviorInfo final {
   OverscrollBehaviorInfo();
 
   // Construct from StyleOverscrollBehavior values.
@@ -711,6 +711,8 @@ struct OverscrollBehaviorInfo {
   friend std::ostream& operator<<(std::ostream& aStream,
                                   const OverscrollBehaviorInfo& aInfo);
 
+  auto MutTiedFields() { return std::tie(mBehaviorX, mBehaviorY); }
+
   OverscrollBehavior mBehaviorX;
   OverscrollBehavior mBehaviorY;
 };