Reduce frequency of requesting bookmark clusters.

components/enhanced_bookmarks/bookmark_server_cluster_service.cc

 // 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.
 
 #include "components/enhanced_bookmarks/bookmark_server_cluster_service.h"
 
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_service.h"
@@ skipping 180 matching lines @@
     const BookmarkNode* node) {
   // Nothing to do.
 }
 
 void BookmarkServerClusterService::EnhancedBookmarkRemoved(
     const BookmarkNode* node) {
   // It is possible to remove the entries from the map here, but as those are
   // filtered in ClustersForBookmark() this is not strictly necessary.
 }
 
+void BookmarkServerClusterService::EnhancedBookmarkNodeChanged(
+    const BookmarkNode* node) {
+  // Nothing to do.
+}
+
 void BookmarkServerClusterService::EnhancedBookmarkAllUserNodesRemoved() {
   if (!cluster_data_.empty()) {
     ClusterMap empty;
     SwapModel(&empty);
   }
 }
 
 void BookmarkServerClusterService::EnhancedBookmarkRemoteIdChanged(
     const BookmarkNode* node,
     const std::string& old_remote_id,
@@ skipping 103 matching lines @@
         return false;
       stars_ids.push_back(stars_id);
     }
     output.insert(std::make_pair(key, stars_ids));
   }
   out_map->swap(output);
   return true;
 }
 
 }  // namespace enhanced_bookmarks