[usecase-webapi] Add pluggable step for the first 50 webapi usecases

Impacted tests(approved): new 0, update 0, delete 31
Unit test platform: [Android]
Unit test result summary: pass 0, fail 0, block 0
Merge pull request #957 from zhuyongyong/yongzhu/usecase/infoToJs

[usecase-webapi] Add pluggable step for the first 50 webapi usecases