Implement ComplexFeature to support permission features with multiple rules.

chrome/common/extensions/features/simple_feature_provider.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_FEATURES_SIMPLE_FEATURE_PROVIDER_H_
-#define CHROME_COMMON_EXTENSIONS_FEATURES_SIMPLE_FEATURE_PROVIDER_H_
-
-#include <set>
-#include <string>
-
-#include "base/memory/linked_ptr.h"
-#include "base/values.h"
-#include "chrome/common/extensions/features/feature.h"
-#include "chrome/common/extensions/features/feature_provider.h"
-
-namespace extensions {
-
-// Reads Features out of a simple JSON file description.
-class SimpleFeatureProvider : public FeatureProvider {
- public:
-  typedef Feature*(*FeatureFactory)();
-
-  // Creates a new SimpleFeatureProvider. Pass null to |factory| to have the
-  // provider create plain old Feature instances.
-  SimpleFeatureProvider(DictionaryValue* root, FeatureFactory factory);
-  virtual ~SimpleFeatureProvider();
-
-  // Gets an instance for the _manifest_features.json file that is baked into
-  // Chrome as a resource.
-  static SimpleFeatureProvider* GetManifestFeatures();
-
-  // Gets an instance for the _permission_features.json file that is baked into
-  // Chrome as a resource.
-  static SimpleFeatureProvider* GetPermissionFeatures();
-
-  // Returns all features described by this instance.
-  std::set<std::string> GetAllFeatureNames() const;
-
-  // Gets the feature |feature_name|, if it exists.
-  virtual Feature* GetFeature(const std::string& feature_name) OVERRIDE;
-
- private:
-  typedef std::map<std::string, linked_ptr<Feature> > FeatureMap;
-  FeatureMap features_;
-
-  FeatureFactory factory_;
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_COMMON_EXTENSIONS_FEATURES_SIMPLE_FEATURE_PROVIDER_H_