[usecase-embedding] Improve Embedding API usecases

- add 1 layout file
- update test purpose for OnCreateWindowRequestedActivity.java

Impacted tests(approved): new 0, update 0, delete 0
Unit test platform: [Android]
Unit test result summary: pass 13, fail 2, block 0
Merge pull request #1076 from zhuyongyong/yongzhu/usecase-embeddingAPI-v10/improve

[usecase-embedding] Improve Embedding API usecases