Implement XWalkSpeechRecognitionManagerDelegate.

Functionality of this class:
Allow speech recognition API to be used by web apps.

BUG=https://crosswalk-project.org/jira/browse/XWALK-728
Merge pull request #1382 from gaochun/speech_recognition

Implement XWalkSpeechRecognitionManagerDelegate.
[Runtime] Enable to update a web application from local

A web application can be updated from local when using "--update" switch
in command line, like this:
$ xwalk --update /path/to/xpk_package.xpk

https://crosswalk-project.org/jira/browse/XWALK-463