Reduce frequency of requesting bookmark clusters.

components/enhanced_bookmarks/enhanced_bookmark_model.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/enhanced_bookmark_model.h"
 
 #include <iomanip>
 #include <sstream>
 
 #include "base/base64.h"
@@ skipping 303 matching lines @@
     const BookmarkNode* node,
     const std::set<GURL>& removed_urls) {
   std::string remote_id = GetRemoteId(node);
   id_map_.erase(remote_id);
   nodes_to_reset_.erase(node);
   set_needs_offline_processing_tasks_.erase(node);
   FOR_EACH_OBSERVER(
       EnhancedBookmarkModelObserver, observers_, EnhancedBookmarkRemoved(node));
 }
 
+void EnhancedBookmarkModel::BookmarkNodeChanged(BookmarkModel* model,
+                                                const BookmarkNode* node) {
+  FOR_EACH_OBSERVER(
+      EnhancedBookmarkModelObserver, observers_,
+      EnhancedBookmarkNodeChanged(model, node));
+}
+
 void EnhancedBookmarkModel::OnWillChangeBookmarkMetaInfo(
     BookmarkModel* model,
     const BookmarkNode* node) {
   prev_remote_id_ = GetRemoteId(node);
 }
 
 void EnhancedBookmarkModel::BookmarkMetaInfoChanged(BookmarkModel* model,
                                                     const BookmarkNode* node) {
   std::string remote_id = GetRemoteId(node);
   if (remote_id != prev_remote_id_) {
@@ skipping 189 matching lines @@
   if (!result)
     return false;
 
   std::string encoded;
   base::Base64Encode(output, &encoded);
   bookmark_model_->SetNodeMetaInfo(node, kImageDataKey, encoded);
   return true;
 }
 
 }  // namespace enhanced_bookmarks