Intent to Implement System App Messaging API

Summary: This implementation is going to add Messaging 
API(http://www.w3.org/2012/sysapps/messaging/). Let Javascript developers have 
ability to send/receive sms/mms and manage messages on Crosswalk. Managing 
features include find by filter, read and delete messages.
Affected component: /xwalk/runtime
Related feature: https://crosswalk-project.org/jira/browse/XWALK-53
Target Release: M4
Implementation details:
There are 3 parts of implementation. SmsManager, MmsManager, MessagingManager. 
Each of the 3 is divided into 2 side, Java side and Javascript side.
1. SmsManager.
1) Send. Javascript side, when send api is called, create and push promise 
object to waiting list. If get send ok/failure message from Java side, found 
promise object by id and call resolve function. Java side, register intent for 
send ok/failure event and delivery ok/failure event. When gets send request 
from Javascript, call Android send sms api. Then receive the ok/failure event, 
and send these back to Javascript side.
2) Receive. Javascript side, register receive event handler. Java side, 
register receive event handler by Android Api. When sms comes, send message to 
Javascript side and call receive event handler.
2. MmsManager. Similar with SmsManager.
3. MessagingManager. Javascript side is similar to SmsManager
1) Find. Search sms/mms by ContentResolver.
2) Read. Read one  sms/mms by ContentResolver.
3) Delete. Delete sms/mms by ContentResolver.


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