Optimize battery optimize page control flow

- Post the setup logic into background and setup once only when leaving
 this page, this can improve the performance since we won't setup
 every time when switching preference

Bug: 195306545
Bug: 199892006
Test: make SettingsRoboTests
Change-Id: I1c3ee4673cf5cdba0abe39f208dfb1412082c579

src/com/android/settings/fuelgauge/BatteryBackupHelper.java

@@ -29,8 +29,8 @@ import android.content.pm.ParceledListSlice;
 import android.content.pm.UserInfo;
 import android.os.Build;
 import android.os.IDeviceIdleController;
-import android.os.RemoteException;
 import android.os.ParcelFileDescriptor;
+import android.os.RemoteException;
 import android.os.ServiceManager;
 import android.os.UserHandle;
 import android.os.UserManager;
@@ -230,7 +230,7 @@ public final class BatteryBackupHelper implements BackupHelper {
                 mBatteryOptimizeUtils != null
                         ? mBatteryOptimizeUtils /*testing only*/
                         : new BatteryOptimizeUtils(mContext, uid, packageName);
-        batteryOptimizeUtils.setAppOptimizationMode(mode);
+        batteryOptimizeUtils.setAppUsageState(mode);
         Log.d(TAG, String.format("restore:%s mode=%d", packageName, mode));
     }