Fix NPE when using VisibilityLogger.

Fix: 31612160
Test: make RunSettingsRoboTests
Change-Id: Ib040a40d27a76d9440f629ed4f768dc4bfde8ac2

src/com/android/settings/UserDictionarySettings.java

@@ -80,6 +80,12 @@ public class UserDictionarySettings extends ListFragment implements Instrumentab
         return MetricsProto.MetricsEvent.USER_DICTIONARY_SETTINGS;
     }
 
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+        mVisibilityLoggerMixin.onAttach(context);
+    }
+
     @Override
     public View onCreateView(
             LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {