Move FeatureSwitch to top-level extensions/

chrome/common/extensions/feature_switch.h

-// Copyright (c) 2012 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_COMMON_EXTENSIONS_FEATURE_SWITCH_H_
-#define CHROME_COMMON_EXTENSIONS_FEATURE_SWITCH_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-
-class CommandLine;
-
-namespace extensions {
-
-// A switch that can turn a feature on or off. Typically controlled via
-// command-line switches but can be overridden, e.g., for testing.
-class FeatureSwitch {
- public:
-  static FeatureSwitch* easy_off_store_install();
-  static FeatureSwitch* global_commands();
-  static FeatureSwitch* script_badges();
-  static FeatureSwitch* script_bubble();
-  static FeatureSwitch* prompt_for_external_extensions();
-  static FeatureSwitch* error_console();
-
-  enum DefaultValue {
-    DEFAULT_ENABLED,
-    DEFAULT_DISABLED
-  };
-
-  enum OverrideValue {
-    OVERRIDE_NONE,
-    OVERRIDE_ENABLED,
-    OVERRIDE_DISABLED
-  };
-
-  // A temporary override for the switch value.
-  class ScopedOverride {
-   public:
-    ScopedOverride(FeatureSwitch* feature, bool override_value);
-    ~ScopedOverride();
-   private:
-    FeatureSwitch* feature_;
-    FeatureSwitch::OverrideValue previous_value_;
-    DISALLOW_COPY_AND_ASSIGN(ScopedOverride);
-  };
-
-  FeatureSwitch(const char* switch_name,
-                DefaultValue default_value);
-  FeatureSwitch(const CommandLine* command_line,
-                const char* switch_name,
-                DefaultValue default_value);
-
-  // Consider using ScopedOverride instead.
-  void SetOverrideValue(OverrideValue value);
-  OverrideValue GetOverrideValue() const;
-
-  bool IsEnabled() const;
-
-  std::string GetLegacyEnableFlag() const;
-  std::string GetLegacyDisableFlag() const;
-
- private:
-  void Init(const CommandLine* command_line,
-            const char* switch_name,
-            DefaultValue default_value);
-
-  const CommandLine* command_line_;
-  const char* switch_name_;
-  bool default_value_;
-  OverrideValue override_value_;
-
-  DISALLOW_COPY_AND_ASSIGN(FeatureSwitch);
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_COMMON_EXTENSIONS_FEATURE_SWITCH_H_