[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.
What's `getUrlFromManifestOnUiThread`? is it parsing the manifest and append the `start_url` after `path`? At least, from the function name it is. I don't think it really tests loading app from manifest.