Implement API features for the Extension API feature system

chrome/common/extensions/features/api_feature.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_API_FEATURE_H_
+#define CHROME_COMMON_EXTENSIONS_FEATURES_API_FEATURE_H_
+
+#include "chrome/common/extensions/features/simple_feature.h"
+
+namespace extensions {
+
+class APIFeature : public SimpleFeature {
+ public:
+  APIFeature();
+  virtual ~APIFeature();
+
+  virtual std::string Parse(const DictionaryValue* value) OVERRIDE;
+};
+
+}  // extensions
+
+#endif  // CHROME_COMMON_EXTENSIONS_FEATURES_API_FEATURE_H_