[webapi] Automate a test for CSS3 Style as reftest

Impacted TCs num(approved): New 0, Update 1, Delete 0
Unit test Platform: Andriod
Unit test result summary: Pass 1, Fail 0, Blocked 0
Merge pull request #1222 from JianfengXu/style/automation

[webapi] Automate a test for CSS3 Style as reftest