Helper classes to scope undo action.

chrome/browser/undo/undo_manager_utils.cc

Index: chrome/browser/undo/undo_manager_utils.cc
diff --git a/chrome/browser/undo/undo_manager_utils.cc b/chrome/browser/undo/undo_manager_utils.cc
new file mode 100644
index 0000000000000000000000000000000000000000..59a79a23bb492c0d2e4f45fcd5f6a3f1782123cf
--- /dev/null
+++ b/chrome/browser/undo/undo_manager_utils.cc
@@ -0,0 +1,29 @@
+// 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.
+
+#include "chrome/browser/undo/undo_manager_utils.h"
+
+#include "chrome/browser/undo/undo_manager.h"
+
+// ScopedSuspendUndoTracking --------------------------------------------------
+
+ScopedSuspendUndoTracking::ScopedSuspendUndoTracking(UndoManager* undo_manager)
+    : undo_manager_(undo_manager) {
+  undo_manager_->SuspendUndoTracking();
+}
+
+ScopedSuspendUndoTracking::~ScopedSuspendUndoTracking() {
+  undo_manager_->ResumeUndoTracking();
+}
+
+// ScopedGroupingAction -------------------------------------------------------
+
+ScopedGroupingAction::ScopedGroupingAction(UndoManager* undo_manager)
+    : undo_manager_(undo_manager) {
+  undo_manager_->StartGroupingActions();
+}
+
+ScopedGroupingAction::~ScopedGroupingAction() {
+  undo_manager_->EndGroupingActions();
+}