Extend LargeIconService to fetch missing favicons from a Google server

components/favicon/core/favicon_service_impl.h

 // Copyright (c) 2012 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_FAVICON_CORE_FAVICON_SERVICE_IMPL_H_
 #define COMPONENTS_FAVICON_CORE_FAVICON_SERVICE_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 84 matching lines @@
       const favicon_base::FaviconUsageDataList& favicon_usage) override;
   void MergeFavicon(const GURL& page_url,
                     const GURL& icon_url,
                     favicon_base::IconType icon_type,
                     scoped_refptr<base::RefCountedMemory> bitmap_data,
                     const gfx::Size& pixel_size) override;
   void SetFavicons(const GURL& page_url,
                    const GURL& icon_url,
                    favicon_base::IconType icon_type,
                    const gfx::Image& image) override;
+  void SetLastResortFavicons(const GURL& page_url,
+                             const GURL& icon_url,
+                             favicon_base::IconType icon_type,
+                             const gfx::Image& image,
+                             base::Callback<void(bool)> callback) override;
   void UnableToDownloadFavicon(const GURL& icon_url) override;
   bool WasUnableToDownloadFavicon(const GURL& icon_url) const override;
   void ClearUnableToDownloadFavicons() override;
 
  private:
   typedef uint32_t MissingFaviconURLHash;
 
   // Helper function for GetFaviconImageForPageURL(), GetRawFaviconForPageURL()
   // and GetFaviconForPageURL().
   base::CancelableTaskTracker::TaskId GetFaviconForPageURLImpl(
@@ skipping 26 matching lines @@
   base::hash_set<MissingFaviconURLHash> missing_favicon_urls_;
   std::unique_ptr<FaviconClient> favicon_client_;
   history::HistoryService* history_service_;
 
   DISALLOW_COPY_AND_ASSIGN(FaviconServiceImpl);
 };
 
 }  // namespace favicon
 
 #endif  // COMPONENTS_FAVICON_CORE_FAVICON_SERVICE_IMPL_H_