[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.
When the content( loadUrlSync(url,content)) of loadUrlSync is not null, the url got will be "about:blank"