Bluetooth: add metrics for pairing with devices without names

Bug: 34685932
Test: make, unit test
Change-Id: I486c210790fe72a594d6144dfd17b01a7a4a9003
Merged-In: I486c210790fe72a594d6144dfd17b01a7a4a9003

proto/src/metrics_constants.proto

@@ -4300,6 +4300,11 @@ message MetricsEvent {
     // OS: O MR
     FIELD_NUM_STATUS_ICONS = 1095;
 
+    // ACTION: Logged when user tries to pair a Bluetooth device without name from Settings app
+    // CATEGORY: SETTINGS
+    // OS: O MR
+    ACTION_SETTINGS_BLUETOOTH_PAIR_DEVICES_WITHOUT_NAMES = 1096;
+
     // Add new aosp constants above this line.
     // END OF AOSP CONSTANTS
   }