[Extensions Bindings] Add activity logging of custom handling

extensions/renderer/bindings/api_request_handler.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_REQUEST_HANDLER_H_
 #define EXTENSIONS_RENDERER_BINDINGS_API_REQUEST_HANDLER_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 67 matching lines @@
   // with the given |response| arguments.
   // Invalid ids are ignored.
   void CompleteRequest(int request_id,
                        const base::ListValue& response,
                        const std::string& error);
 
   // Invalidates any requests that are associated with |context|.
   void InvalidateContext(v8::Local<v8::Context> context);
 
   APILastError* last_error() { return &last_error_; }
+  int last_sent_request_id() const { return last_sent_request_id_; }
 
   std::set<int> GetPendingRequestIdsForTesting() const;
 
  private:
   struct PendingRequest {
     PendingRequest(v8::Isolate* isolate,
                    v8::Local<v8::Function> callback,
                    v8::Local<v8::Context> context,
                    const std::vector<v8::Local<v8::Value>>& callback_args);
     ~PendingRequest();
     PendingRequest(PendingRequest&&);
     PendingRequest& operator=(PendingRequest&&);
 
     v8::Isolate* isolate;
     v8::Global<v8::Context> context;
     v8::Global<v8::Function> callback;
     std::vector<v8::Global<v8::Value>> callback_arguments;
     blink::WebUserGestureToken user_gesture_token;
   };
 
   // The next available request identifier.
   int next_request_id_ = 0;
 
+  // The id of the last request we sent to the browser. This can be used as a
+  // flag for whether or not a request was sent (if the last_sent_request_id_
+  // changes).
+  int last_sent_request_id_ = -1;
+
   // A map of all pending requests.
   std::map<int, PendingRequest> pending_requests_;
 
   SendRequestMethod send_request_;
 
   // The method to call into a JS with specific arguments. We curry this in
   // because the manner we want to do this is a unittest (e.g.
   // v8::Function::Call) can be significantly different than in production
   // (where we have to deal with e.g. blocking javascript).
   CallJSFunction call_js_;
 
   APILastError last_error_;
 
   DISALLOW_COPY_AND_ASSIGN(APIRequestHandler);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_BINDINGS_API_REQUEST_HANDLER_H_