[misc][XWALK-1930] Add test cases for xwalk AAR library

Impacted tests(approved): new 8, update 0, delete 0
Unit test platform: [Android]
Unit test result summary: pass 8, fail 0, block 0
Merge pull request #920 from zhuyongyong/yongzhu/marven-repo/test

[misc][XWALK-1930] Add test cases for xwalk AAR library