Add tron metric logging

- one tracking id for every picker type

Bug: 73952488
Test: m RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.datetime.timezone
Change-Id: Ia487f1657d6ed1f0fb40b61f39f4a47c38bd6179

src/com/android/settings/datetime/timezone/RegionZonePicker.java

@@ -22,6 +22,7 @@ import android.icu.util.TimeZone;
 import android.support.annotation.VisibleForTesting;
 import android.util.Log;
 
+import com.android.internal.logging.nano.MetricsProto;
 import com.android.settings.R;
 import com.android.settings.datetime.timezone.model.FilteredCountryTimeZones;
 import com.android.settings.datetime.timezone.model.TimeZoneData;
@@ -46,6 +47,11 @@ public class RegionZonePicker extends BaseTimeZoneInfoPicker {
         super(R.string.date_time_select_zone, R.string.search_settings, true, false);
     }
 
+    @Override
+    public int getMetricsCategory() {
+        return MetricsProto.MetricsEvent.SETTINGS_ZONE_PICKER_TIME_ZONE;
+    }
+
     /**
      * Add the extra region id into the result.
      */