(bug 42454) Show "add more files from flickr"

Adds support to upload more images from flickr after the user has already
uploaded some files.

Change-Id: Ic955e27d1d999491f84a92d694c8c8d6632e59b6
TODO: refactor code as this shouldn't be under updateFileCounts()
Merge "(bug 42454) Show "add more files from flickr""