[Extensions] Introduce a ScopedExtensionDialogAutoConfirm

extensions/browser/extension_dialog_auto_confirm.cc

+// 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.
+
+#include "extensions/browser/extension_dialog_auto_confirm.h"
+
+namespace extensions {
+
+namespace {
+ScopedTestDialogAutoConfirm::AutoConfirm g_extension_dialog_auto_confirm =
+    ScopedTestDialogAutoConfirm::NONE;
+}
+
+ScopedTestDialogAutoConfirm::ScopedTestDialogAutoConfirm(
+    ScopedTestDialogAutoConfirm::AutoConfirm override_value)
+    : old_value_(g_extension_dialog_auto_confirm) {
+  g_extension_dialog_auto_confirm = override_value;
+}
+
+ScopedTestDialogAutoConfirm::~ScopedTestDialogAutoConfirm() {
+  g_extension_dialog_auto_confirm = old_value_;
+}
+
+ScopedTestDialogAutoConfirm::AutoConfirm
+ScopedTestDialogAutoConfirm::GetAutoConfirmValue() {
+  return g_extension_dialog_auto_confirm;
+}
+
+}  // namespace extensions