[Tizen] Native File System API

Completed features list:

Create file
Read file
Write file
Remove file
Create Directory
List Directory Entries
Remove Directory

BUG=https://crosswalk-project.org/jira/browse/XWALK-1875
Compared system.gyp and media.gyp, yes, seems we do not have "sysroot“ difference, then I would agree with @tmpsantos that use `pkg-config` directly.