Extension Settings API: make it so that when leveldb storage areas fail to be

chrome/browser/extensions/settings/failing_settings_storage.h

+// Copyright (c) 2011 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 CHROME_BROWSER_EXTENSIONS_SETTINGS_FAILING_SETTINGS_STORAGE_H_
+#define CHROME_BROWSER_EXTENSIONS_SETTINGS_FAILING_SETTINGS_STORAGE_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "chrome/browser/extensions/settings/settings_storage.h"
+
+namespace extensions {
+
+// Settings storage area which fails every request.
+class FailingSettingsStorage : public SettingsStorage {
+ public:
+  FailingSettingsStorage() {}
+
+  // SettingsStorage implementation.
+  virtual ReadResult Get(const std::string& key) OVERRIDE;
+  virtual ReadResult Get(const std::vector<std::string>& keys) OVERRIDE;
+  virtual ReadResult Get() OVERRIDE;
+  virtual WriteResult Set(const std::string& key, const Value& value) OVERRIDE;
+  virtual WriteResult Set(const DictionaryValue& values) OVERRIDE;
+  virtual WriteResult Remove(const std::string& key) OVERRIDE;
+  virtual WriteResult Remove(const std::vector<std::string>& keys) OVERRIDE;
+  virtual WriteResult Clear() OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(FailingSettingsStorage);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_SETTINGS_FAILING_SETTINGS_STORAGE_H_