Helper classes to scope undo action.

chrome/browser/undo/undo_manager_utils.h

+// 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_UNDO_MANAGER_UTILS_H_
+#define CHROME_BROWSER_UNDO_UNDO_MANAGER_UTILS_H_
+
+#include "base/basictypes.h"
+
+class UndoManager;
+
+// ScopedSuspendUndoTracking ---------------------------------------------------
+
+// Scopes the suspension of the undo tracking for non-user initiated changes
+// such as those occuring during profile synchronization.
+class ScopedSuspendUndoTracking {
+ public:
+  explicit ScopedSuspendUndoTracking(UndoManager* undo_manager);
+  ~ScopedSuspendUndoTracking();
+
+ private:
+  UndoManager* undo_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedSuspendUndoTracking);
+};
+
+// ScopedGroupingAction --------------------------------------------------------
+
+// Scopes the grouping of a set of changes into one undoable action.
+class ScopedGroupingAction {
+ public:
+  explicit ScopedGroupingAction(UndoManager* undo_manager);
+  ~ScopedGroupingAction();
+
+ private:
+  UndoManager* undo_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedGroupingAction);
+};
+
+#endif  // CHROME_BROWSER_UNDO_UNDO_MANAGER_UTILS_H_