[usecase-webapi] Improve UserTiming usecase

- Add sections to seperate operation and result.

Impacted TCs num(approved): New 0, Update 1, Delete 0
Unit test Platform: [Andriod]
Test result summary: Pass 1, Fail 0, Blocked 0
Merge pull request #605 from JianfengXu/xujf/usertiming/update

[usecase-webapi] Improve UserTiming usecase