ServiceWorker: Reset idle timer when we dispatch message event

content/browser/service_worker/service_worker_version.cc

Index: content/browser/service_worker/service_worker_version.cc
diff --git a/content/browser/service_worker/service_worker_version.cc b/content/browser/service_worker/service_worker_version.cc
index db9350a62ffd903432d75d9f46c334d3cfd6749f..ff185072741e0c3924c982e8da48573ee9a068c4 100644
--- a/content/browser/service_worker/service_worker_version.cc
+++ b/content/browser/service_worker/service_worker_version.cc
@@ -645,6 +645,10 @@ void ServiceWorkerVersion::DispatchMessageEventInternal(
     return;
   }
 
+  // TODO(kinuko): Cleanup this (and corresponding unit test) when message
+  // event becomes extendable, round-trip event. (crbug.com/498596)
+  RestartTick(&idle_time_);
+
   MessagePortMessageFilter* filter =
       embedded_worker_->message_port_message_filter();
   std::vector<int> new_routing_ids;