[embeddingapi][XWALK-2425] Add 2 cases for onReceivedTitle


- Add 2 cases for triggering onReceivedTitle method when navigation back
- Failure analysis: When navigation back, the onReceivedTitle won't be triggered.

Impacted tests(approved): new 2, update 1, delete 0
Unit test platform: [Android]
Unit test result summary: pass 1, fail 1, block 0