Now we have the requirement to provide the option to enable the universal access from file uri(setAllowUniversalAccessFromFileURLs) on Android. This option in blink only works on local url(file scheme), and not on app scheme. But we needs for the apps which is packaged with app scheme. It's straightforward to mark app scheme as a local one to make blink recognize the app scheme and enable this feature. I know there are difference between local and app, but it should not conflict with marking a label of "local" on app scheme in blink.
I think the same issue will happen on other platforms to use the option of setAllowUniversalAccessFromFileURLs. 
How do you think? @kenchris @anssik
If you have any concern on Tizen or other platforms, I would to ground it under Android scope firstly.