Add a new field elapsed_time_millis into Settings' atom

- Add a new field elapsed_time_millis to keep the elapsed time
  since setup wizard finished.

Fixes: 260660970
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.core
Change-Id: I28d13c4987ae1e4ef12eaff27e26a5121cf8093b

src/com/android/settings/SettingsApplication.java

@@ -25,6 +25,7 @@ import android.util.FeatureFlagUtils;
 import androidx.window.embedding.SplitController;
 
 import com.android.settings.activityembedding.ActivityEmbeddingRulesController;
+import com.android.settings.core.instrumentation.ElapsedTimeUtils;
 import com.android.settings.homepage.SettingsHomepageActivity;
 import com.android.settings.spa.SettingsSpaEnvironment;
 import com.android.settingslib.applications.AppIconCacheManager;
@@ -42,6 +43,7 @@ public class SettingsApplication extends Application {
     @Override
     public void onCreate() {
         super.onCreate();
+        ElapsedTimeUtils.assignSuwFinishedTimeStamp(this.getApplicationContext());
 
         // Set Spa environment.
         setSpaEnvironment();