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

- Add 80 cases about the unit tests for embedding api
- Failure analysis:8 cases are failed because the methods of embedding api are not exist.
Others are failed or blocked because the methods of embedding api do not support.

Impated TCs num(approved): New 80, Update 0, Delete 0
Unit test platform: [Android]
Android Test result summary: Pass 68, Fail 12, Blocked 4
Merge pull request #444 from zhuyongyong/yongzhu/embeddingAPI-UnitTests/add

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