Adds back BookmarkNode::IsVisible. Turns out we want to conditionally

chrome/browser/bookmarks/bookmark_model.h

 // Copyright (c) 2011 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 CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_H_
 #define CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_H_
 #pragma once
 
 #include <set>
 #include <vector>
@@ skipping 92 matching lines @@
   bool is_favicon_loaded() const { return is_favicon_loaded_; }
   void set_is_favicon_loaded(bool loaded) { is_favicon_loaded_ = loaded; }
 
   HistoryService::Handle favicon_load_handle() const {
     return favicon_load_handle_;
   }
   void set_favicon_load_handle(HistoryService::Handle handle) {
     favicon_load_handle_ = handle;
   }
 
+  // Accessor method for controlling the visibility of a bookmark node/sub-tree.
+  // Note that visibility is not propagated down the tree hierarchy so if a
+  // parent node is marked as invisible, a child node may return "Visible". This
+  // function is primarily useful when traversing the model to generate a UI
+  // representation but we may want to suppress some nodes.
+  virtual bool IsVisible() const;
+
   // TODO(sky): Consider adding last visit time here, it'll greatly simplify
   // HistoryContentsProvider.
 
  private:
   friend class BookmarkModel;
 
   // A helper function to initialize various fields during construction.
   void Initialize(int64 id);
 
   // Called when the favicon becomes invalid.
@@ skipping 325 matching lines @@
   scoped_ptr<BookmarkIndex> index_;
 
   base::WaitableEvent loaded_signal_;
 
   scoped_ptr<BookmarkExpandedStateTracker> expanded_state_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkModel);
 };
 
 #endif  // CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_H_