Adding tron logging events for standalone headsets.

Standalone headsets will use tron to log headset events.

Bug: 62103076
Test: Builds and logger can log events
Change-Id: I761ddae4501aa8b8d0d9dacc91f04fd13a2c771c
diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index b3a4007..2edcd71 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -4134,6 +4134,31 @@
     // OS: O DR
     ACTION_APP_LOCATION_CHECK = 1021;
 
+    // Device headset status
+    // CATEGORY: OTHER
+    //  SUBTYPE: 1 is DON, 2 is DOFF
+    // OS: O DR
+    ACTION_HEADSET_STATUS = 1022;
+
+    // Device Headset Plug status
+    // CATEGORY: OTHER
+    //  SUBTYPE: 1 is AC power, 2 is USB power, 3 is Unplug
+    // OS: O DR
+    ACTION_HEADSET_PLUG = 1023;
+
+    // Device Headset battery level on Plug
+    // CATEGORY: OTHER
+    // FIELD - The battery percentage when the user decided to plug in
+    // Type: integer
+    // OS: O DR
+    FIELD_PLUG_BATTERY_PERCENTAGE = 1024;
+
+    // Device Headset Pose status
+    // CATEGORY: OTHER
+    //  SUBTYPE: 1 is 6DOF, 2 is 3DOF
+    // OS: O DR
+    ACTION_HEADSET_POSE_STATUS = 1025;
+
     // Add new aosp constants above this line.
     // END OF AOSP CONSTANTS
   }