Add logging constant for wifi tether setting page.

Bug: 37253404
Test: builds
Change-Id: If237e7d7fc02506aa80acfab7929086ac7172a53
(cherry picked from commit 45f3372d736f33e96cb5a214bdaee32e3f2d3f9a)
diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index fa2b1ee..7e7ef19 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -4095,6 +4095,9 @@
     // OS: O DR
     CAPTIVE_PORTAL_LOGIN_ACTIVITY_SSL_ERROR = 1013;
 
+    // OPEN: Settings > Network > Tether > Wi-Fi hotspot
+    WIFI_TETHER_SETTINGS = 1014;
+
     // Add new aosp constants above this line.
     // END OF AOSP CONSTANTS
   }