[Extensions] Add extension feature generation code

extensions/common/features/complex_feature.h

 // Copyright 2014 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_COMMON_FEATURES_COMPLEX_FEATURE_H_
 #define EXTENSIONS_COMMON_FEATURES_COMPLEX_FEATURE_H_
 
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
+#include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/features/feature.h"
 #include "extensions/common/manifest.h"
 
 namespace extensions {
 
 // A ComplexFeature is composed of one or many Features. A ComplexFeature
 // is available if any Feature (i.e. permission rule) that composes it is
 // available, but not if only some combination of Features is available.
@@ skipping 17 matching lines @@
                                     Platform platform) const override;
 
   bool IsIdInBlacklist(const std::string& extension_id) const override;
   bool IsIdInWhitelist(const std::string& extension_id) const override;
 
  protected:
   // Feature:
   bool IsInternal() const override;
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(FeaturesGenerationTest, FeaturesTest);
+
   FeatureList features_;
 
   DISALLOW_COPY_AND_ASSIGN(ComplexFeature);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_FEATURES_COMPLEX_FEATURE_H_