add metrics for gestural notification expansions

Bug: 28146482
Change-Id: If202846c0d235830c7b41d76b55bdcc21d0ab90d
diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index f8cdf9b..a1487e3 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -2212,6 +2212,12 @@
     // Notification group expansion state toggled by the expand affordance.
     ACTION_NOTIFICATION_GROUP_EXPANDER = 408;
 
+    // Notification expansion state toggled by the expand gesture.
+    ACTION_NOTIFICATION_GESTURE_EXPANDER = 409;
+
+    // Notification group expansion state toggled by the expand gesture.
+    ACTION_NOTIFICATION_GROUP_GESTURE_EXPANDER = 410;
+
     // Add new aosp constants above this line.
     // END OF AOSP CONSTANTS
   }