[embedding][XWALK-2374] Add new cases for onCreateWindowRequested and so on


- Add new cases for onCreateWindowRequested, onIconAvailable and onReceivedIcon.
- Failure analysis: The onCreateWindowRequested method could not be triggered when new window was opened.

Impacted tests(approved): new 8, update 0, delete 0
Unit test platform: [Android]
Unit test result summary: pass 2, fail 6, block 0