Update platform interface for working with app-tools 0.5
Update platform interface for working with app-tools 0.5

BUG=XWALK-4162

crosswalk-project/crosswalk-app-tools-deb,hgl888/crosswalk-app-tools-deb,hgl888/crosswalk-app-tools-deb,crosswalk-project/crosswalk-app-tools-deb,hgl888/crosswalk-app-tools-deb,crosswalk-project/crosswalk-app-tools-deb