Issue 6008 - Expose updates version via lib/prefs.js

This change exposes the updates version to the extension so that it can decide whether or not the updates page should be shown.

See also https://codereview.adblockplus.org/29664623/ for related changes to adblockpluschrome.

[saroyanm, 2018-01-30 15:00:41]

https://codereview.adblockplus.org/29680702/diff/29680703/lib/ui.js
File lib/ui.js (right):

https://codereview.adblockplus.org/29680702/diff/29680703/lib/ui.js#newcode1
lib/ui.js:1: /*
All looks fine and I don't want to block the review, but what is the reason of
naming this ui.js ?

It seems like we would like to use something similar to prefs.js in
adblockpluschrome repository. So what about naming this ui-prefs.js ? Or
prefs.js but map to ui-prefs in platform ?

It feels for me a bit contr-intuitive because it might make a false assumption
that we are loading whole ui module rather than just prefs ?

[Thomas Greiner, 2018-01-30 18:20:39]

https://codereview.adblockplus.org/29680702/diff/29680703/lib/ui.js
File lib/ui.js (right):

https://codereview.adblockplus.org/29680702/diff/29680703/lib/ui.js#newcode1
lib/ui.js:1: /*
On 2018/01/30 15:00:40, saroyanm wrote:
> All looks fine and I don't want to block the review, but what is the reason of
> naming this ui.js ?
> 
> It seems like we would like to use something similar to prefs.js in
> adblockpluschrome repository. So what about naming this ui-prefs.js ? Or
> prefs.js but map to ui-prefs in platform ?
> 
> It feels for me a bit contr-intuitive because it might make a false assumption
> that we are loading whole ui module rather than just prefs ?

Done.

I only called it "ui.js" because I couldn't think of any other functionality
that we might want to expose to the background page yet so I tried to keep the
name generic.

Therefore I really like renaming it to "prefs.js" to use it for exposing
preferences. Great idea!

[saroyanm, 2018-01-31 10:24:27]

LGTM considering that the https://codereview.adblockplus.org/29664623 review
will be updated accordingly.