BookmarkClient can add extra nodes to BookmarkModel.

chrome/browser/ui/views/bookmarks/bookmark_editor_view.cc

 // Copyright (c) 2012 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/ui/views/bookmarks/bookmark_editor_view.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 477 matching lines @@
   if (!b_node)
     b_node = tree_model_->GetRoot()->GetChild(0);  // Bookmark bar node.
 
   tree_view_->SetSelectedNode(b_node);
 }
 
 BookmarkEditorView::EditorNode* BookmarkEditorView::CreateRootNode() {
   EditorNode* root_node = new EditorNode(base::string16(), 0);
   const BookmarkNode* bb_root_node = bb_model_->root_node();
   CreateNodes(bb_root_node, root_node);
-  DCHECK(root_node->child_count() >= 2 && root_node->child_count() <= 3);
+  DCHECK(root_node->child_count() >= 2 && root_node->child_count() <= 4);
   DCHECK_EQ(BookmarkNode::BOOKMARK_BAR, bb_root_node->GetChild(0)->type());
   DCHECK_EQ(BookmarkNode::OTHER_NODE, bb_root_node->GetChild(1)->type());
-  if (root_node->child_count() == 3)
+  if (root_node->child_count() >= 3)
     DCHECK_EQ(BookmarkNode::MOBILE, bb_root_node->GetChild(2)->type());
   return root_node;
 }
 
 void BookmarkEditorView::CreateNodes(const BookmarkNode* bb_node,
                                      BookmarkEditorView::EditorNode* b_node) {
   for (int i = 0; i < bb_node->child_count(); ++i) {
     const BookmarkNode* child_bb_node = bb_node->GetChild(i);
     if (child_bb_node->IsVisible() && child_bb_node->is_folder()) {
       EditorNode* new_b_node = new EditorNode(child_bb_node->GetTitle(),
@@ skipping 123 matching lines @@
   }
   return context_menu_model_.get();
 }
 
 void BookmarkEditorView::EditorTreeModel::SetTitle(
     ui::TreeModelNode* node,
     const base::string16& title) {
   if (!title.empty())
     ui::TreeNodeModel<EditorNode>::SetTitle(node, title);
 }