Extend LargeIconService to fetch missing favicons from a Google server

components/history/core/browser/history_backend.cc

Index: components/history/core/browser/history_backend.cc
diff --git a/components/history/core/browser/history_backend.cc b/components/history/core/browser/history_backend.cc
index 62187120cff3ae3d97a93a60b1fdcd8759dff2e5..2db1a7696a81eb9e1cb4748047ca290b2188c854 100644
--- a/components/history/core/browser/history_backend.cc
+++ b/components/history/core/browser/history_backend.cc
@@ -1699,12 +1699,13 @@ void HistoryBackend::MergeFavicon(
   ScheduleCommit();
 }
 
-void HistoryBackend::SetFavicons(const GURL& page_url,
-                                 favicon_base::IconType icon_type,
-                                 const GURL& icon_url,
-                                 const std::vector<SkBitmap>& bitmaps) {
+favicon_base::FaviconID HistoryBackend::SetFavicons(
+    const GURL& page_url,
+    favicon_base::IconType icon_type,
+    const GURL& icon_url,
+    const std::vector<SkBitmap>& bitmaps) {
   if (!thumbnail_db_ || !db_)
-    return;
+    return favicon_base::FaviconID(0);
 
   DCHECK_GE(kMaxFaviconBitmapsPerIconURL, bitmaps.size());
 
@@ -1735,6 +1736,23 @@ void HistoryBackend::SetFavicons(const GURL& page_url,
     SendFaviconChangedNotificationForIconURL(icon_url);
   }
   ScheduleCommit();
+  return icon_id;
+}
+
+void HistoryBackend::SetExpiredFaviconsIfNoneKnown(
+    const GURL& page_url,
+    favicon_base::IconType icon_type,
+    const GURL& icon_url,
+    const std::vector<SkBitmap>& bitmaps) {
+  if (!thumbnail_db_ || !db_)
+    return;
+
+  if (!thumbnail_db_->GetIconMappingsForPageURL(page_url,
+                                                /*mapping_data*/ nullptr)) {
+    favicon_base::FaviconID icon_id =
+        SetFavicons(page_url, icon_type, icon_url, bitmaps);
+    thumbnail_db_->SetFaviconOutOfDate(icon_id);
+  }
 }
 
 void HistoryBackend::SetFaviconsOutOfDateForPage(const GURL& page_url) {