[SysApps][Android] Implement W3C SysApps Messaging API …
The implementation is based on 29 November 2013 editor's draft version
http://www.w3.org/2012/sysapps/messaging/

Completed features list:
* Send/receive SMS messages.
* Find/list SMS messages
* Find/list SMS conversations
* Delete SMS messages
* Delete SMS conversations
* Mark SMS message read status
* Mark SMS conversation read status

Feature: https://crosswalk-project.org/jira/browse/XWALK-53

Conflicts:
	xwalk_android.gypi