Extend LargeIconService to fetch missing favicons from a Google server

chrome/browser/favicon/large_icon_service_factory.cc

 // Copyright 2015 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.
 
 #include "chrome/browser/favicon/large_icon_service_factory.h"
 
 #include "base/memory/singleton.h"
 #include "chrome/browser/favicon/favicon_service_factory.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/search/suggestions/image_decoder_impl.h"
 #include "components/favicon/core/favicon_service.h"
 #include "components/favicon/core/large_icon_service.h"
+#include "components/image_fetcher/image_decoder.h"
+#include "components/image_fetcher/image_fetcher_impl.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 
 // static
 favicon::LargeIconService* LargeIconServiceFactory::GetForBrowserContext(
     content::BrowserContext* context) {
   return static_cast<favicon::LargeIconService*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
 }
@@ skipping 12 matching lines @@
 
 LargeIconServiceFactory::~LargeIconServiceFactory() {}
 
 content::BrowserContext* LargeIconServiceFactory::GetBrowserContextToUse(
       content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }
 
 KeyedService* LargeIconServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
+  Profile* profile = Profile::FromBrowserContext(context);
   favicon::FaviconService* favicon_service =
-      FaviconServiceFactory::GetForProfile(Profile::FromBrowserContext(context),
+      FaviconServiceFactory::GetForProfile(profile,
                                            ServiceAccessType::EXPLICIT_ACCESS);
   return new favicon::LargeIconService(
       favicon_service, content::BrowserThread::GetBlockingPool()
                            ->GetTaskRunnerWithShutdownBehavior(
-                               base::SequencedWorkerPool::SKIP_ON_SHUTDOWN));
+                               base::SequencedWorkerPool::SKIP_ON_SHUTDOWN),
+      base::MakeUnique<image_fetcher::ImageFetcherImpl>(
+          base::MakeUnique<suggestions::ImageDecoderImpl>(),
+          profile->GetRequestContext()));
 }
 
 bool LargeIconServiceFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }