Add metrics event for trampoline activity

Bug: 62022517
Test: none
Change-Id: Id5561b0efb0a4de496182a56e6e2417753f4b8a6
diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index d6ca23f..a4849fc 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -4214,6 +4214,11 @@
     // OS: O DR
     ACTION_CAMERA_EVENT = 1032;
 
+    // OPEN: Settings > Trampoline Intent > Settings page
+    // CATEGORY: SETTINGS
+    // OS: O DR
+    TRAMPOLINE_SETTINGS_EVENT = 1033;
+
     // ---- End O-DR1 Constants, all O-DR1 constants go above this line ----
 
     // Add new aosp constants above this line.