Extend LargeIconService to fetch missing favicons from a Google server

components/favicon/core/test/mock_favicon_service.h

 // Copyright 2017 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_TEST_MOCK_FAVICON_SERVICE_H_
 #define COMPONENTS_FAVICON_CORE_TEST_MOCK_FAVICON_SERVICE_H_
 
 #include <vector>
 
 #include "base/task/cancelable_task_tracker.h"
@@ skipping 84 matching lines @@
                void(const GURL& page_url,
                     const GURL& icon_url,
                     favicon_base::IconType icon_type,
                     scoped_refptr<base::RefCountedMemory> bitmap_data,
                     const gfx::Size& pixel_size));
   MOCK_METHOD4(SetFavicons,
                void(const GURL& page_url,
                     const GURL& icon_url,
                     favicon_base::IconType icon_type,
                     const gfx::Image& image));
+  MOCK_METHOD5(SetLastResortFavicons,
+               void(const GURL& page_url,
+                    const GURL& icon_url,
+                    favicon_base::IconType icon_type,
+                    const gfx::Image& image,
+                    base::Callback<void(bool)> callback));
   MOCK_METHOD1(UnableToDownloadFavicon, void(const GURL& icon_url));
   MOCK_CONST_METHOD1(WasUnableToDownloadFavicon, bool(const GURL& icon_url));
   MOCK_METHOD0(ClearUnableToDownloadFavicons, void());
 };
 
 }  // namespace favicon
 
 #endif  // COMPONENTS_FAVICON_CORE_TEST_MOCK_FAVICON_SERVICE_H_