[Extensions Bindings] Add activity logging of custom handling

extensions/renderer/bindings/api_bindings_system.h

 // Copyright 2016 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_RENDERER_BINDINGS_API_BINDINGS_SYSTEM_H_
 #define EXTENSIONS_RENDERER_BINDINGS_API_BINDINGS_SYSTEM_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 33 matching lines @@
       const BindingAccessChecker* access_checker)>;
 
   APIBindingsSystem(
       const binding::RunJSFunction& call_js,
       const binding::RunJSFunctionSync& call_js_sync,
       const GetAPISchemaMethod& get_api_schema,
       const BindingAccessChecker::AvailabilityCallback& is_available,
       const APIRequestHandler::SendRequestMethod& send_request,
       const APIEventHandler::EventListenersChangedMethod&
           event_listeners_changed,
+      const APIBinding::OnSilentRequest& on_silent_request,
       APILastError last_error);
   ~APIBindingsSystem();
 
   // Returns a new v8::Object representing the api specified by |api_name|.
   v8::Local<v8::Object> CreateAPIInstance(
       const std::string& api_name,
       v8::Local<v8::Context> context,
       APIBindingHooks** hooks_out);
 
   // Responds to the request with the given |request_id|, calling the callback
@@ skipping 70 matching lines @@
   std::map<std::string, CustomTypeHandler> custom_types_;
 
   binding::RunJSFunction call_js_;
 
   binding::RunJSFunctionSync call_js_sync_;
 
   // The method to retrieve the DictionaryValue describing a given extension
   // API. Curried in for testing purposes so we can use fake APIs.
   GetAPISchemaMethod get_api_schema_;
 
+  // The method to call when the system silently handles an API request without
+  // notifying the browser.
+  APIBinding::OnSilentRequest on_silent_request_;
+
   DISALLOW_COPY_AND_ASSIGN(APIBindingsSystem);
 };
 
 }  // namespace
 
 #endif  // EXTENSIONS_RENDERER_BINDINGS_API_BINDINGS_SYSTEM_H_