[Extensions Bindings] Add activity logging of custom handling

extensions/renderer/bindings/api_request_handler.h

Index: extensions/renderer/bindings/api_request_handler.h
diff --git a/extensions/renderer/bindings/api_request_handler.h b/extensions/renderer/bindings/api_request_handler.h
index c395aa7a605be475b9b961087e916d8b5dc3df76..a2ce5da8ed61b090a1fd1dbfe1d76725c75b6c0b 100644
--- a/extensions/renderer/bindings/api_request_handler.h
+++ b/extensions/renderer/bindings/api_request_handler.h
@@ -85,6 +85,7 @@ class APIRequestHandler {
   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;
 
@@ -108,6 +109,11 @@ class APIRequestHandler {
   // 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_;