Introduce session type parameter to extension features

extensions/common/features/feature.h

 // Copyright 2013 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_FEATURE_H_
 #define EXTENSIONS_COMMON_FEATURES_FEATURE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 56 matching lines @@
   enum AvailabilityResult {
     IS_AVAILABLE,
     NOT_FOUND_IN_WHITELIST,
     INVALID_URL,
     INVALID_TYPE,
     INVALID_CONTEXT,
     INVALID_LOCATION,
     INVALID_PLATFORM,
     INVALID_MIN_MANIFEST_VERSION,
     INVALID_MAX_MANIFEST_VERSION,
+    INVALID_SESSION_TYPE,
     NOT_PRESENT,
     UNSUPPORTED_CHANNEL,
     FOUND_IN_BLACKLIST,
     MISSING_COMMAND_LINE_SWITCH,
   };
 
   // Container for AvailabiltyResult that also exposes a user-visible error
   // message in cases where the feature is not available.
   class Availability {
    public:
@@ skipping 76 matching lines @@
  protected:
   std::string name_;
   bool no_parent_;
   // TODO(devlin): Remove this once we set the feature channel for tests.
   bool check_channel_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_FEATURES_FEATURE_H_