Fixed elapsed_time_millis in SettingsUIChanged event

This change stores timestamp when received com.google.android.setupwizard.SETUP_WIZARD_FINISHED. This timestamp will be used to calculate elapsed_time_millis for SettingsUIChanged event after SUW complete. This enables to analyze how the user uses Settings in a specific time span after setup.

Bug: 344466251
Test: metrics related change only
Flag: EXEMPT metrics change only

Change-Id: I85b15f1eb5e5a4502a27d8588bb01e59b7ad83b5

tests/robotests/src/com/android/settings/SettingsInitializeTest.java

@@ -24,6 +24,7 @@ import android.content.pm.ShortcutInfo;
 
 import android.content.pm.ShortcutManager;
 
+import com.android.settings.core.instrumentation.ElapsedTimeUtils;
 import java.util.Collections;
 import org.junit.Before;
 import org.junit.Test;
@@ -96,4 +97,12 @@ public class SettingsInitializeTest {
         assertThat(updatedShortcuts).hasSize(1);
         assertThat(updatedShortcuts.get(0)).isSameInstanceAs(info);
     }
+
+    @Test
+    public void onReceive_suwFinished_shouldHaveElapsedTime() {
+        mSettingsInitialize.onReceive(mContext, new Intent(SetupWizardUtils.ACTION_SETUP_WIZARD_FINISHED));
+
+        final long elapsedTime = ElapsedTimeUtils.getElapsedTime(System.currentTimeMillis());
+        assertThat(elapsedTime).isNotEqualTo(-1L);
+    }
 }