Supporting undoing bookmark deletion without creating new ID.

components/bookmarks/browser/bookmark_undo_provider.h

+// Copyright 2015 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 COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_UNDO_PROVIDER_H_
+#define COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_UNDO_PROVIDER_H_
+
+#include "base/memory/scoped_ptr.h"
+
+namespace bookmarks {
+
+class BookmarkNode;
+
+// The interface for providing undo support.
+class BookmarkUndoProvider {
+ public:
+  // Restores the previously removed |node| at |parent| in the specified
+  // |index|.
+  virtual void RestoreRemovedNode(const BookmarkNode* parent,
+                                  int index,
+                                  scoped_ptr<BookmarkNode> node) = 0;
+
+ protected:
+  virtual ~BookmarkUndoProvider() {}
+};
+
+}  // namespace bookmarks
+
+#endif  // COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_UNDO_PROVIDER_H_