add metrics for notification and group expansion

Bug: 28146482
Change-Id: Id7f71873ba33f85c1a1f2c48b47f78d40df46c0d
diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index 46da957..f8cdf9b 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -2206,6 +2206,12 @@
     // Settings launched from expanded quick settings.
     ACTION_QS_EXPANDED_SETTINGS_LAUNCH = 406;
 
+    // Notification expansion state toggled by the expand affordance.
+    ACTION_NOTIFICATION_EXPANDER = 407;
+
+    // Notification group expansion state toggled by the expand affordance.
+    ACTION_NOTIFICATION_GROUP_EXPANDER = 408;
+
     // Add new aosp constants above this line.
     // END OF AOSP CONSTANTS
   }