Split feature definitions into extensions and chrome features.

extensions/common/features/json_feature_provider_source.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_FEATURE_JSON_FEATURE_PROVIDER_SOURCE_H_
+#define EXTENSIONS_COMMON_FEATURE_JSON_FEATURE_PROVIDER_SOURCE_H_
+
+#include "base/values.h"
+
+namespace extensions {
+
+// A JSONFeatureProviderSource loads JSON dictionary files that
+// define features.
+class JSONFeatureProviderSource {
+ public:
+  explicit JSONFeatureProviderSource(const std::string& name);
+  ~JSONFeatureProviderSource();
+
+  // Adds the JSON dictionary file to this provider, merging its values with
+  // the current dictionary. Key collisions are treated as errors.
+  void LoadJSON(int resource_id);
+
+  // Returns the parsed dictionary.
+  const base::DictionaryValue& dictionary() { return dictionary_; }
+
+ private:
+  // The name of this feature type; only used for debugging.
+  const std::string name_;
+
+  base::DictionaryValue dictionary_;
+
+  DISALLOW_COPY_AND_ASSIGN(JSONFeatureProviderSource);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_COMMON_FEATURE_JSON_FEATURE_PROVIDER_SOURCE_H_