Update all bookmarks which use an icon URL when a favicon's bitmap is updated

components/history/core/browser/history_backend_notifier.h

Index: components/history/core/browser/history_backend_notifier.h
diff --git a/components/history/core/browser/history_backend_notifier.h b/components/history/core/browser/history_backend_notifier.h
index a4253e23499a4cccc8af58200537ba99933993be..0c0cfd835f0a42fcbfb06edb398bddd812064bf7 100644
--- a/components/history/core/browser/history_backend_notifier.h
+++ b/components/history/core/browser/history_backend_notifier.h
@@ -21,8 +21,13 @@ class HistoryBackendNotifier {
   HistoryBackendNotifier() {}
   virtual ~HistoryBackendNotifier() {}
 
-  // Sends notification that favicon for |urls| have changed.
-  virtual void NotifyFaviconChanged(const std::set<GURL>& urls) = 0;
+  // Sends notification that the favicons for the given page URLs (e.g.
+  // http://www.google.com) and the given icon URL (e.g.
+  // http://www.google.com/favicon.ico) have changed. It is valid to call
+  // NotifyFaviconsChanged() with non-empty |page_urls| and an empty |icon_url|
+  // and vice versa.
+  virtual void NotifyFaviconsChanged(const std::set<GURL>& page_urls,
+                                     const GURL& icon_url) = 0;
 
   // Sends notification that |transition| to |row| occurred at |visit_time|
   // following |redirects| (empty if there is no redirects).