Enable _api_features.json to block APIs from service worker contexts.

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 102 matching lines @@
   static Platform GetCurrentPlatform();
 
   // Gets the Feature::Location value for the specified Manifest::Location.
   static Location ConvertLocation(Manifest::Location extension_location);
 
   virtual std::set<Context>* GetContexts() = 0;
 
   // Tests whether this is an internal API or not.
   virtual bool IsInternal() const = 0;
 
+  // Returns True for features excluded from service worker backed contexts.
+  virtual bool IsBlockedInServiceWorker() const = 0;
+
   // Returns true if the feature is available to be parsed into a new extension
   // manifest.
   Availability IsAvailableToManifest(const std::string& extension_id,
                                      Manifest::Type type,
                                      Location location,
                                      int manifest_version) const {
     return IsAvailableToManifest(extension_id, type, location, manifest_version,
                                  GetCurrentPlatform());
   }
   virtual Availability IsAvailableToManifest(const std::string& extension_id,
@@ skipping 23 matching lines @@
 
  protected:
   std::string name_;
   std::set<std::string> dependencies_;
   bool no_parent_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_FEATURES_FEATURE_H_