[Android] Add sample and test cases for Embedding API

This patch is to add sample and test cases for the following
interface of XWalkUIClient:
onCreateWindowRequested
onIconAvailable
onReceivedIcon
Merge pull request #2573 from lincsoon/TestEmbeddingAPI

[Android] Add sample and test cases for Embedding API (Re-submit)
Bump version to 11.39.240.0
[Tizen] Enable background-support attribute in settings element.

When "background-support" is enabled in config.xml application will not suspend when goes background.
* enable: Web Application's execution MUST NOT be suspended when it is put into background
* disable: Web Application's execution MUST be suspended when it is put into
  background

BUG=XWALK-1148