Extend LargeIconService to fetch missing favicons from a Google server

components/history/core/browser/history_backend.h

Index: components/history/core/browser/history_backend.h
diff --git a/components/history/core/browser/history_backend.h b/components/history/core/browser/history_backend.h
index 2a62a79deccf02c0276c3ab2b043e86708491a9f..0e4f821a3e662e8715fa319017e7cdfd2f9f5988 100644
--- a/components/history/core/browser/history_backend.h
+++ b/components/history/core/browser/history_backend.h
@@ -320,10 +320,15 @@ class HistoryBackend : public base::RefCountedThreadSafe<HistoryBackend>,
                     scoped_refptr<base::RefCountedMemory> bitmap_data,
                     const gfx::Size& pixel_size);
 
-  void SetFavicons(const GURL& page_url,
-                   favicon_base::IconType icon_type,
-                   const GURL& icon_url,
-                   const std::vector<SkBitmap>& bitmaps);
+  favicon_base::FaviconID SetFavicons(const GURL& page_url,
+                                      favicon_base::IconType icon_type,
+                                      const GURL& icon_url,
+                                      const std::vector<SkBitmap>& bitmaps);
+
+  void SetExpiredFaviconsIfNoneKnown(const GURL& page_url,
+                                     favicon_base::IconType icon_type,
+                                     const GURL& icon_url,
+                                     const std::vector<SkBitmap>& bitmaps);
 
   void SetFaviconsOutOfDateForPage(const GURL& page_url);