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.

browser/base/content/test/newtab/head.js

@@ -2,8 +2,11 @@
    http://creativecommons.org/publicdomain/zero/1.0/ */
 
 const PREF_NEWTAB_ENABLED = "browser.newtabpage.enabled";
+const PREF_NEWTAB_DIRECTORYSOURCE = "browser.newtabpage.directorySource";
 
 Services.prefs.setBoolPref(PREF_NEWTAB_ENABLED, true);
+// start with no directory links by default
+Services.prefs.setCharPref(PREF_NEWTAB_DIRECTORYSOURCE, "data:application/json,{}");
 
 let tmp = {};
 Cu.import("resource://gre/modules/Promise.jsm", tmp);
@@ -26,6 +29,7 @@ registerCleanupFunction(function () {
     gWindow.gBrowser.removeTab(gWindow.gBrowser.tabs[1]);
 
   Services.prefs.clearUserPref(PREF_NEWTAB_ENABLED);
+  Services.prefs.clearUserPref(PREF_NEWTAB_DIRECTORYSOURCE);
 });
 
 /**

browser/components/nsBrowserGlue.js

@@ -22,6 +22,9 @@ XPCOMUtils.defineLazyModuleGetter(this, "AddonManager",
 XPCOMUtils.defineLazyModuleGetter(this, "ContentClick",
                                   "resource:///modules/ContentClick.jsm");
 
+XPCOMUtils.defineLazyModuleGetter(this, "DirectoryLinksProvider",
+                                  "resource://gre/modules/DirectoryLinksProvider.jsm");
+
 XPCOMUtils.defineLazyModuleGetter(this, "NetUtil",
                                   "resource://gre/modules/NetUtil.jsm");
 
@@ -475,6 +478,8 @@ BrowserGlue.prototype = {
     WebappManager.init();
     PageThumbs.init();
     NewTabUtils.init();
+    DirectoryLinksProvider.init();
+    NewTabUtils.links.addProvider(DirectoryLinksProvider);
     BrowserNewTabPreloader.init();
 #ifdef NIGHTLY_BUILD
     if (Services.prefs.getBoolPref("dom.identity.enabled")) {

toolkit/modules/NewTabUtils.jsm

@@ -577,6 +577,9 @@ let PlacesProvider = {
               title: title,
               frecency: frecency,
               lastVisitDate: lastVisitDate,
+              bgColor: "transparent",
+              type: "history",
+              imageURISpec: null,
             });
           }
         }