[Tizen][Runtime] Enable hosted app support on Tizen.

On Tizen, a web application use <tizen:content> to set entry page will be
recognized as hosted app. This patch will enable this feature in Crosswalk
runtime.

BUG=XWALK-1492
Merge pull request #2359 from takethathe/hosted

[Tizen][Runtime] Enable hosted app support on Tizen.