Add baked-in favicons for default popular sites on NTP

components/ntp_tiles/popular_sites_impl.h

 // Copyright 2016 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 COMPONENTS_NTP_TILES_POPULAR_SITES_IMPL_H_
 #define COMPONENTS_NTP_TILES_POPULAR_SITES_IMPL_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 23 matching lines @@
 
 namespace variations {
 class VariationsService;
 }
 
 class PrefService;
 class TemplateURLService;
 
 namespace ntp_tiles {
 
+class IconCacher;
+
 using ParseJSONCallback = base::Callback<void(
     const std::string& unsafe_json,
     const base::Callback<void(std::unique_ptr<base::Value>)>& success_callback,
     const base::Callback<void(const std::string&)>& error_callback)>;
 
 // Actual (non-test) implementation of the PopularSites interface. Caches the
 // downloaded file on disk to avoid re-downloading on every startup.
 class PopularSitesImpl : public PopularSites, public net::URLFetcherDelegate {
  public:
   PopularSitesImpl(
@@ skipping 13 matching lines @@
   const SitesVector& sites() const override;
   GURL GetLastURLFetched() const override;
   GURL GetURLToFetch() override;
   std::string GetCountryToFetch() override;
   std::string GetVersionToFetch() override;
   const base::ListValue* GetCachedJson() override;
 
   // Register preferences used by this class.
   static void RegisterProfilePrefs(
       user_prefs::PrefRegistrySyncable* user_prefs);
+  // Adds icon resources for default sites in prefs to cache.
+  static void AddIconsForDefaultPagesToCacher(const PrefService& prefs,
+                                              IconCacher* cacher);
 
  private:
   // Fetch the popular sites at the given URL, overwriting any cache in prefs
   // that already exists.
   void FetchPopularSites();
 
   // net::URLFetcherDelegate implementation.
   void OnURLFetchComplete(const net::URLFetcher* source) override;
 
   void OnJsonParsed(std::unique_ptr<base::Value> json);
@@ skipping 17 matching lines @@
   GURL pending_url_;
 
   base::WeakPtrFactory<PopularSitesImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PopularSitesImpl);
 };
 
 }  // namespace ntp_tiles
 
 #endif  // COMPONENTS_NTP_TILES_POPULAR_SITES_IMPL_H_