Adds an experiment that enabled SuggestionsService suggestions (MostLikely) on LocalNTP

chrome/browser/search/instant_service.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SEARCH_INSTANT_SERVICE_H_
 #define CHROME_BROWSER_SEARCH_INSTANT_SERVICE_H_
 
 #include <set>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "components/history/core/browser/history_types.h"
 #include "components/history/core/browser/top_sites_observer.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/search_engines/template_url_service_observer.h"
+#include "components/suggestions/proto/suggestions.pb.h"
+#include "components/suggestions/suggestions_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "url/gurl.h"
 
 class InstantIOContext;
 struct InstantMostVisitedItem;
 class InstantSearchPrerenderer;
 class InstantServiceObserver;
 class Profile;
 struct TemplateURLData;
@@ skipping 93 matching lines @@
   void OnTemplateURLServiceChanged() override;
 
   // TopSitesObserver:
   void TopSitesLoaded(history::TopSites* top_sites) override;
   void TopSitesChanged(history::TopSites* top_sites,
                        ChangeReason change_reason) override;
 
   // Called when a renderer process is terminated.
   void OnRendererProcessTerminated(int process_id);
 
+  // Called when SuggestionsService has a new suggestions profile available.
+  void OnSuggestionsAvailable(const suggestions::SuggestionsProfile& profile);
+
   // Called when we get new most visited items from TopSites, registered as an
   // async callback. Parses them and sends them to the renderer via
   // SendMostVisitedItems.
   void OnMostVisitedItemsReceived(const history::MostVisitedURLList& data);
 
   // Notifies the observer about the last known most visited items.
   void NotifyAboutMostVisitedItems();
 
 #if defined(ENABLE_THEMES)
   // Theme changed notification handler.
   void OnThemeChanged(ThemeService* theme_service);
 #endif
 
   void ResetInstantSearchPrerenderer();
 
   Profile* const profile_;
 
   // The TemplateURLService that we are observing. It will outlive this
   // InstantService due to the dependency declared in InstantServiceFactory.
   TemplateURLService* template_url_service_;
 
   // The process ids associated with Instant processes.
   std::set<int> process_ids_;
 
-  // InstantMostVisitedItems sent to the Instant Pages.
+  // InstantMostVisitedItems from TopSites.
   std::vector<InstantMostVisitedItem> most_visited_items_;
 
+  // InstantMostVisitedItems from SuggestionService.
+  std::vector<InstantMostVisitedItem> suggestions_items_;
+
   // Theme-related data for NTP overlay to adopt themes.
   scoped_ptr<ThemeBackgroundInfo> theme_info_;
 
   // The start-edge margin of the omnibox, used by the Instant page to align
   // text or assets properly with the omnibox.
   int omnibox_start_margin_;
 
   base::ObserverList<InstantServiceObserver> observers_;
 
   content::NotificationRegistrar registrar_;
 
   scoped_refptr<InstantIOContext> instant_io_context_;
 
   // Set to NULL if the default search provider does not support Instant.
   scoped_ptr<InstantSearchPrerenderer> instant_prerenderer_;
 
   // Used to check whether notifications from TemplateURLService indicate a
   // change that affects the default search provider.
   scoped_ptr<TemplateURLData> previous_default_search_provider_;
   GURL previous_google_base_url_;
 
+  // Suggestions Service to fetch server suggestions.
+  suggestions::SuggestionsService* suggestions_service_;
+
   // Used for Top Sites async retrieval.
   base::WeakPtrFactory<InstantService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantService);
 };
 
 #endif  // CHROME_BROWSER_SEARCH_INSTANT_SERVICE_H_