Reduce frequency of requesting bookmark clusters.

components/enhanced_bookmarks/enhanced_bookmark_model_observer.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_ENHANCED_BOOKMARKS_ENHANCED_BOOKMARK_MODEL_OBSERVER_H_
 #define COMPONENTS_ENHANCED_BOOKMARKS_ENHANCED_BOOKMARK_MODEL_OBSERVER_H_
 
 #include <string>
 
 class BookmarkNode;
 
 namespace enhanced_bookmarks {
 
 class EnhancedBookmarkModelObserver {
  public:
   // Called when the model has finished loading.
   virtual void EnhancedBookmarkModelLoaded() = 0;
 
   // Called from EnhancedBookmarkModel::ShutDown.
   virtual void EnhancedBookmarkModelShuttingDown() = 0;
 
   // Called when a node is added to the model.
   virtual void EnhancedBookmarkAdded(const BookmarkNode* node) = 0;
 
   // Called when a node is removed from the model.
   virtual void EnhancedBookmarkRemoved(const BookmarkNode* node) = 0;
 
+  // Called when a node has changed.
+  virtual void EnhancedBookmarkNodeChanged(const BookmarkNode* node) = 0;
+
   // Called when all user editable nodes are removed from the model.
   virtual void EnhancedBookmarkAllUserNodesRemoved() = 0;
 
   // Called when the remote id of a node changes. If |remote_id| is empty, the
   // remote id has been cleared. This could happen if multiple nodes with the
   // same remote id has been detected.
   virtual void EnhancedBookmarkRemoteIdChanged(const BookmarkNode* node,
                                                const std::string& old_remote_id,
                                                const std::string& remote_id) {};
 
  protected:
   virtual ~EnhancedBookmarkModelObserver() {}
 };
 
 }  // namespace enhanced_bookmarks
 #endif  // COMPONENTS_ENHANCED_BOOKMARKS_ENHANCED_BOOKMARK_MODEL_OBSERVER_H_