(into bug975211) Bug 975228 - Create logic to merge frecency-pages and Tiles (Tile equiv 1000 frecency)
additional metadata in PlacesProvider links
Links owns a DirectoryTilesProvider
move test_NewTabUtils.js into xpcshell/newtab
disable DirectoryTiles in newtab browser tests by default, because tests currently depend on tiles to be empty
switch name to DirectoryProvider
change directorySource pref name in browser/{..}/tests/newtab/head.js
end to end directory tiles test