Upstream Chrome on iOS source code [4/11].

ios/chrome/browser/ui/bookmarks/undo_manager_bridge_observer.mm

+// Copyright 2014 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.
+
+#include "ios/chrome/browser/ui/bookmarks/undo_manager_bridge_observer.h"
+
+#include "base/logging.h"
+
+namespace bookmarks {
+UndoManagerBridge::UndoManagerBridge(id<UndoManagerBridgeObserver> observer)
+    : observer_(observer) {
+  DCHECK(observer);
+}
+
+void UndoManagerBridge::OnUndoManagerStateChange() {
+  [observer_ undoManagerChanged];
+}
+}  // namespace bookmarks