[embedding][XWALK-895] Add new embedding api tests for xwalk

[embedding][XWALK-895] Add new embedding api tests for crosswalk
Impated TCs num:New 80, Update 0, Delete 0 
Unit test platform: android
Android Test result summary:pass 65,Fail 11,Blocked 4
Comments：
7 failed because of not exist.
Load a url and return this url