diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index db0e15e..31218ed 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -1221,6 +1221,14 @@
 
     bool mHdrLayerInfoChanged = false;
 
+    struct LayerEvent {
+        uid_t uid;
+        int32_t layerId;
+        ui::Dataspace dataspace;
+        std::chrono::milliseconds timeSinceLastEvent;
+    };
+    std::vector<LayerEvent> mLayerEvents;
+
     // Used to ensure we omit a callback when HDR layer info listener is newly added but the
     // scene hasn't changed
     bool mAddingHDRLayerInfoListener = false;