Eliminate Bookmarks dependence to bookmark_undo_utils.h.

chrome/browser/bookmarks/bookmark_model.h

 // 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.
 
 #ifndef CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_H_
 #define CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_H_
 
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 274 matching lines @@
 
   void AddObserver(BookmarkModelObserver* observer);
   void RemoveObserver(BookmarkModelObserver* observer);
 
   // Notifies the observers that an extensive set of changes is about to happen,
   // such as during import or sync, so they can delay any expensive UI updates
   // until it's finished.
   void BeginExtensiveChanges();
   void EndExtensiveChanges();
 
+  // Notifies the observers that a set of changes initiated by a single user
+  // action is about to happen and has completed.
+  void BeginGroupedChanges();

[sky, 2014/02/06 17:48:27]

Can you make these private and the only way to use it is by way of a scoper
object that is friended? (ScopedGroupBookmarkActions (move it into bookmarks
directory)).

[Tom Cassiotis, 2014/02/21 17:51:45]

Done.

+  void EndGroupedChanges();
+
   // Returns true if this bookmark model is currently in a mode where extensive
   // changes might happen, such as for import and sync. This is helpful for
   // observers that are created after the mode has started, and want to check
   // state during their own initializer, such as the NTP.
   bool IsDoingExtensiveChanges() const { return extensive_changes_ > 0; }
 
   // Removes the node at the given |index| from |parent|. Removing a folder node
   // recursively removes all nodes. Observers are notified immediately.
   void Remove(const BookmarkNode* parent, int index);
 
@@ skipping 266 matching lines @@
 
   // See description of IsDoingExtensiveChanges above.
   int extensive_changes_;
 
   scoped_ptr<BookmarkExpandedStateTracker> expanded_state_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkModel);
 };
 
 #endif  // CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_H_