[Extensions] Introduce a ScopedExtensionDialogAutoConfirm

extensions/browser/extension_dialog_auto_confirm.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 EXTENSIONS_BROWSER_EXTENSION_DIALOG_AUTO_CONFIRM_H_
+#define EXTENSIONS_BROWSER_EXTENSION_DIALOG_AUTO_CONFIRM_H_
+
+#include "base/auto_reset.h"
+
+namespace extensions {
+
+class ScopedTestDialogAutoConfirm {
+ public:
+  enum AutoConfirm {
+    NONE,    // The prompt will show normally.
+    ACCEPT,  // The prompt will always accept.
+    CANCEL,  // The prompt will always cancel.
+  };
+
+  explicit ScopedTestDialogAutoConfirm(AutoConfirm override_value);
+  ~ScopedTestDialogAutoConfirm();
+
+  static AutoConfirm GetAutoConfirmValue();
+
+ private:
+  AutoConfirm old_value_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedTestDialogAutoConfirm);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_EXTENSION_DIALOG_AUTO_CONFIRM_H_