Bookmark Undo service for multiple level undo/redo of bookmarks.

chrome/browser/undo/bookmark_renumber_observer.h

Index: chrome/browser/undo/bookmark_renumber_observer.h
diff --git a/chrome/browser/undo/bookmark_renumber_observer.h b/chrome/browser/undo/bookmark_renumber_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..f2847fdce9d53cdeb27dea66c03b0cc431135ca7
--- /dev/null
+++ b/chrome/browser/undo/bookmark_renumber_observer.h
@@ -0,0 +1,18 @@
+// Copyright 2013 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_UNDO_BOOKMARK_RENUMBER_OBSERVER_H_
+#define CHROME_BROWSER_UNDO_BOOKMARK_RENUMBER_OBSERVER_H_
+
+class BookmarkRenumberObserver {
+ public:
+  // Should be called when a bookmark id has been renumbered so that any

[sky, 2013/09/04 21:52:18]

Should be called -> Called (or invoked if you prefer)

[Tom Cassiotis, 2013/09/05 12:51:58]

Done.

+  // BookmarkUndoOperations that refer to that bookmark can be updated.
+  virtual void OnBookmarkRenumbered(int64 old_id, int64 new_id) = 0;
+
+ protected:
+  virtual ~BookmarkRenumberObserver() {}
+};
+
+#endif  // CHROME_BROWSER_UNDO_BOOKMARK_RENUMBER_OBSERVER_H_