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>
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "components/ntp_tiles/popular_sites.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "url/gurl.h"
 
 namespace base {
 class Value;
 }
 
 namespace net {
 class URLRequestContextGetter;
 }
 
+namespace favicon {
+class FaviconService;
+}
+
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 namespace variations {
 class VariationsService;
 }
 
 class PrefService;
 class TemplateURLService;
 
 namespace ntp_tiles {
 
 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(
       const scoped_refptr<base::SequencedWorkerPool>& blocking_pool,
       PrefService* prefs,
       const TemplateURLService* template_url_service,
       variations::VariationsService* variations_service,
+      favicon::FaviconService* favicon_service,
       net::URLRequestContextGetter* download_context,
       const base::FilePath& directory,
       ParseJSONCallback parse_json);
 
   ~PopularSitesImpl() override;
 
   // PopularSites implementation.
   bool MaybeStartFetch(bool force_download,
                        const FinishedCallback& callback) override;
   const SitesVector& sites() const override;
@@ skipping 36 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_