Extend LargeIconService to fetch missing favicons from a Google server

components/history/core/browser/history_service.cc

 // 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.
 
 // The history system runs on a background thread so that potentially slow
 // database operations don't delay the browser. This backend processing is
 // represented by HistoryBackend. The HistoryService's job is to dispatch to
 // that thread.
 //
 // Main thread                       History thread
@@ skipping 602 matching lines @@
 
 void HistoryService::SetFavicons(const GURL& page_url,
                                  favicon_base::IconType icon_type,
                                  const GURL& icon_url,
                                  const std::vector<SkBitmap>& bitmaps) {
   DCHECK(backend_task_runner_) << "History service being called after cleanup";
   DCHECK(thread_checker_.CalledOnValidThread());
   if (history_client_ && !history_client_->CanAddURL(page_url))
     return;
 
-  ScheduleTask(PRIORITY_NORMAL,
-               base::Bind(&HistoryBackend::SetFavicons, history_backend_,
-                          page_url, icon_type, icon_url, bitmaps));
+  ScheduleTask(
+      PRIORITY_NORMAL,
+      base::Bind(base::IgnoreResult(&HistoryBackend::SetFavicons),
+                 history_backend_, page_url, icon_type, icon_url, bitmaps));
+}
+
+void HistoryService::SetExpiredFaviconsIfNoneKnown(
+    const GURL& page_url,
+    favicon_base::IconType icon_type,
+    const GURL& icon_url,
+    const std::vector<SkBitmap>& bitmaps) {
+  DCHECK(backend_task_runner_) << "History service being called after cleanup";
+  DCHECK(thread_checker_.CalledOnValidThread());
+  if (history_client_ && !history_client_->CanAddURL(page_url))
+    return;
+
+  ScheduleTask(
+      PRIORITY_NORMAL,
+      base::Bind(&HistoryBackend::SetExpiredFaviconsIfNoneKnown,
+                 history_backend_, page_url, icon_type, icon_url, bitmaps));
 }
 
 void HistoryService::SetFaviconsOutOfDateForPage(const GURL& page_url) {
   DCHECK(backend_task_runner_) << "History service being called after cleanup";
   DCHECK(thread_checker_.CalledOnValidThread());
   ScheduleTask(PRIORITY_NORMAL,
                base::Bind(&HistoryBackend::SetFaviconsOutOfDateForPage,
                           history_backend_, page_url));
 }
 
@@ skipping 513 matching lines @@
   return favicon_changed_callback_list_.Add(callback);
 }
 
 void HistoryService::NotifyFaviconsChanged(const std::set<GURL>& page_urls,
                                            const GURL& icon_url) {
   DCHECK(thread_checker_.CalledOnValidThread());
   favicon_changed_callback_list_.Notify(page_urls, icon_url);
 }
 
 }  // namespace history