Add the basic infrastructure for the Behavior feature type: BehaviorFeature and

extensions/common/features/behavior_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_BEHAVIOR_FEATURE_H_
+#define EXTENSIONS_COMMON_FEATURES_BEHAVIOR_FEATURE_H_
+
+#include <string>
+
+#include "extensions/common/features/simple_feature.h"
+
+namespace extensions {
+
+// Implementation of the features in _behavior_features.json.
+//
+// For now, this is just constants + a vacuous implementation of SimpleFeature,
+// for consistency with the other Feature types. One day we may add some
+// additional functionality. One day we may also generate the feature names.
+class BehaviorFeature : public SimpleFeature {
+ public:
+  // Constants corresponding to keys in _behavior_features.json.
+  static const char* kWhitelistedForIncognito;
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_COMMON_FEATURES_BEHAVIOR_FEATURE_H_