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

components/bookmarks/browser/bookmark_model.h

 // Copyright 2014 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.
 
 #ifndef COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_MODEL_H_
 #define COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_MODEL_H_
 
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 278 matching lines @@
   // Returns the set of meta info keys that should not be copied when a node is
   // cloned.
   const std::set<std::string>& non_cloned_keys() const {
     return non_cloned_keys_;
   }
 
   // Sets the sync transaction version of |node|.
   void SetNodeSyncTransactionVersion(const BookmarkNode* node,
                                      int64 sync_transaction_version);
 
-  // Notify BookmarkModel that the favicons for |urls| have changed and have to
-  // be refetched. This notification is sent by BookmarkClient.
-  void OnFaviconChanged(const std::set<GURL>& urls);
+  // Notify BookmarkModel 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.
+  void OnFaviconsChanged(const std::set<GURL>& page_urls,
+                         const GURL& icon_url);
 
   // Returns the client used by this BookmarkModel.
   BookmarkClient* client() const { return client_; }
 
  private:
   friend class BookmarkCodecTest;
+  friend class BookmarkModelFaviconTest;
   friend class BookmarkStorage;
   friend class ScopedGroupBookmarkActions;
   friend class TestBookmarkClient;
 
   // Used to order BookmarkNodes by URL.
   class NodeURLComparator {
    public:
     bool operator()(const BookmarkNode* n1, const BookmarkNode* n2) const {
       return n1->url() < n2->url();
     }
@@ skipping 124 matching lines @@
   scoped_ptr<BookmarkExpandedStateTracker> expanded_state_tracker_;
 
   std::set<std::string> non_cloned_keys_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkModel);
 };
 
 }  // namespace bookmarks
 
 #endif  // COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_MODEL_H_