Original discussion in CL for 337010. See http://codereview.chromium.org/337...

chrome/browser/cocoa/bookmark_tree_browser_cell.h

+// Copyright (c) 2009 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_COCOA_BOOKMARK_TREE_BROWSER_CELL_H_
+#define CHROME_BROWSER_COCOA_BOOKMARK_TREE_BROWSER_CELL_H_
+
+#import <Cocoa/Cocoa.h>
+
+class BookmarkNode;
+
+// Provides a custom cell as used in the BookmarkEditor.xib's folder tree
+// browser view.  This cell customization adds target and action support
+// not provided by the NSBrowserCell as well as contextual information
+// identifying the bookmark node being edited and the column matrix
+// control in which is contained the cell.
+@interface BookmarkTreeBrowserCell : NSBrowserCell {
+ @private
+  const BookmarkNode* bookmarkNode_;  // weak
+  NSMatrix* matrix_;  // weak
+  id target_;  // weak
+  SEL action_;
+}
+
+@property (assign) NSMatrix* matrix;
+@property (assign) id target;
+@property (assign) SEL action;
+
+- (const BookmarkNode*)bookmarkNode;
+- (void)setBookmarkNode:(const BookmarkNode*)bookmarkNode;
+
+@end
+
+#endif // CHROME_BROWSER_COCOA_BOOKMARK_TREE_BROWSER_CELL_H_