Use MetricsEvent to log page views for new IA pages.

Bug: 33812754
Test: RunSettingsRoboTests
Change-Id: Ib49daa1078df44f50ecfa351c061d36849708fd7

src/com/android/settings/system/SystemDashboardFragment.java

@@ -19,6 +19,7 @@ import android.content.Context;
 import android.os.UserManager;
 import android.provider.SearchIndexableResource;
 
+import com.android.internal.logging.nano.MetricsProto;
 import com.android.settings.R;
 import com.android.settings.core.PreferenceController;
 import com.android.settings.dashboard.DashboardFragment;
@@ -42,7 +43,7 @@ public class SystemDashboardFragment extends DashboardFragment {
 
     @Override
     public int getMetricsCategory() {
-        return SYSTEM_CATEGORY_FRAGMENT;
+        return MetricsProto.MetricsEvent.SETTINGS_SYSTEM_CATEGORY;
     }
 
     @Override