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

chrome/browser/undo/undo_manager.h

Index: chrome/browser/undo/undo_manager.h
diff --git a/chrome/browser/undo/undo_manager.h b/chrome/browser/undo/undo_manager.h
index 4031cba74a387eabc5147a2e26c26d8456ceeee9..b3a156c9fe1c96546085d11d7d8e4b6a9eb18137 100644
--- a/chrome/browser/undo/undo_manager.h
+++ b/chrome/browser/undo/undo_manager.h
@@ -24,9 +24,13 @@ class UndoGroup {
   bool has_operations() const {
     return !operations_.empty();
   }
-
   void Undo();
 
+  template <typename F>
+  void ForEachUndoOperation(F fn) {
+    std::for_each(operations_.begin(), operations_.end(), fn);
+  }
+
  private:
   ScopedVector<UndoOperation> operations_;
 
@@ -61,11 +65,27 @@ class UndoManager {
   void ResumeUndoTracking();
   bool IsUndoTrakingSuspended() const;
 
+  // Remove all undo and redo operations.
+  void Reset();
+
+  // Applies |fn| to UndoOperations in all UndoGroups.
+  template <typename F>
+  void ForEachUndoOperation(F &fn) {
+    for (ScopedVector<UndoGroup>::iterator it = undo_actions_.begin();
+         it != undo_actions_.end(); ++it) {
+      (*it)->ForEachUndoOperation(fn);
+    }
+    for (ScopedVector<UndoGroup>::iterator it = redo_actions_.begin();
+         it != redo_actions_.end(); ++it) {
+      (*it)->ForEachUndoOperation(fn);
+    }
+  }
+
  private:
   void Undo(bool* performing_indicator,
             ScopedVector<UndoGroup>* active_undo_group);
+  bool is_user_action() const { return !performing_undo_ && !performing_redo_; }
 
-  void RemoveAllActions();
   void RemoveAllRedoActions();
 
   ScopedVector<UndoGroup>* GetActiveUndoGroup();