bookmarks: Add HasBookmarks() method to BookmarkModel API.

chrome/browser/bookmarks/bookmark_model.cc

 // Copyright (c) 2010 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 "chrome/browser/bookmarks/bookmark_model.h"
 
 #include "app/l10n_util.h"
 #include "app/l10n_util_collator.h"
 #include "base/callback.h"
 #include "base/scoped_vector.h"
@@ skipping 330 matching lines @@
   for (NodesOrderedByURLSet::iterator i = nodes_ordered_by_url_set_.begin();
        i != nodes_ordered_by_url_set_.end(); ++i) {
     const GURL* url = &((*i)->GetURL());
     // Only add unique URLs.
     if (!last_url || *url != *last_url)
       urls->push_back(*url);
     last_url = url;
   }
 }
 
+bool BookmarkModel::HasBookmarks() {
+  AutoLock url_lock(url_lock_);
+  return !nodes_ordered_by_url_set_.empty();
+}
+
 bool BookmarkModel::IsBookmarked(const GURL& url) {
   AutoLock url_lock(url_lock_);
   return IsBookmarkedNoLock(url);
 }
 
 const BookmarkNode* BookmarkModel::GetNodeByID(int64 id) {
   // TODO(sky): TreeNode needs a method that visits all nodes using a predicate.
   return GetNodeByID(&root_, id);
 }
 
@@ skipping 455 matching lines @@
 void BookmarkModel::SetFileChanged() {
   file_changed_ = true;
 }
 
 BookmarkLoadDetails* BookmarkModel::CreateLoadDetails() {
   BookmarkNode* bb_node = CreateBookmarkNode();
   BookmarkNode* other_folder_node = CreateOtherBookmarksNode();
   return new BookmarkLoadDetails(
       bb_node, other_folder_node, new BookmarkIndex(profile()), next_node_id_);
 }