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But the app wouldn't know exactly where in the app to put them. It would get messy real fast.
 
that's not really an answer :(
they should make an app to put share sheets on all apps, just like they did with the app "maximizer" to make all apps fullscreen.

http://chpwn.com/apps/maximizer.html

Well the reason I put that is because we simply don't know if Google is going to integrate Share Sheets into their browser. I suppose a tweak like that could work. It really just comes down to Google's choice of implementing the feature or not.
 
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