(into bug975211) Bug 975228 - Create logic to merge frecency-pages and Tiles (Tile equiv 1000 frecency)
additional metadata in PlacesProvider links
start with no directory links in newtab browser test head.js
Replace imageURI with imageURISpec
add DirectoryLinksProvider in nsBrowserGlue
move DirectoryLinksProvider.init() under NewTabUtils.init() in nsBrowserGlue
add clearUserPref for directory links source in browser test head