Bug 975228 - Create logic to merge frecency-pages and Tiles (Tile equiv 1000 frecency) [r=adw]
Use DirectoryLinksProvider for Firefox and make PlacesProvider match in expected Links format.
Make sure there's at least 2 of each type so Telemetry doesn't know for sure which links were used.
Bug 972930 - Clicks (raw number) for tiles [r=adw]
Provide an array of expected directory link types to count how many were clicked.
Bug 972936 - Overall impressions metrics for New Tab [r=adw]
Add a histogram for each of the 3 directory link types and count how many were shown.