Merge "Make the default getTimeSpentInApp() return empty"

import android.annotation.UserIdInt;

import android.content.Intent;

import androidx.annotation.NonNull;

import java.util.List;

import java.util.Set;

     * Returns a user readable text explaining how much time user has spent in an app at a

     * pre-specified duration.

     */

    @NonNull

    default CharSequence getTimeSpentInApp(String packageName) {

        return null;

        return "";

    }

    /**

import androidx.test.ext.junit.runners.AndroidJUnit4

import com.android.settings.R

import com.android.settings.testutils.FakeFeatureFactory

import com.android.settingslib.spaprivileged.framework.common.storageStatsManager

import org.junit.Before

import org.junit.Rule

import org.junit.Test

import org.junit.runner.RunWith

import org.mockito.Mock

import org.mockito.Mockito

import org.mockito.Mockito.any

import org.mockito.Mockito.anyInt

import org.mockito.Spy