Keep alive ServiceWorkers when devtools is attached

content/browser/service_worker/embedded_worker_instance.h

Index: content/browser/service_worker/embedded_worker_instance.h
diff --git a/content/browser/service_worker/embedded_worker_instance.h b/content/browser/service_worker/embedded_worker_instance.h
index b5d57296ce57419da65aa9740b193d6065380686..5f1f1cdc372776c8b59406ea2cc89b9abe389a48 100644
--- a/content/browser/service_worker/embedded_worker_instance.h
+++ b/content/browser/service_worker/embedded_worker_instance.h
@@ -86,6 +86,11 @@ class CONTENT_EXPORT EmbeddedWorkerInstance {
   // IPC couldn't be sent to the worker.
   ServiceWorkerStatusCode Stop();
 
+  // Stops the worker if the worker is not being debugged (i.e. devtools is
+  // not attached). This method is called by a stop-worker timer to kill
+  // idle workers.
+  void StopIfIdle();
+
   // Sends |message| to the embedded worker running in the child process.
   // It is invalid to call this while the worker is not in RUNNING status.
   ServiceWorkerStatusCode SendMessage(const IPC::Message& message);
@@ -104,6 +109,8 @@ class CONTENT_EXPORT EmbeddedWorkerInstance {
   void AddListener(Listener* listener);
   void RemoveListener(Listener* listener);
 
+  void set_devtools_attached(bool attached) { devtools_attached_ = attached; }
+
  private:
   typedef ObserverList<Listener> ListenerList;
 
@@ -192,6 +199,9 @@ class CONTENT_EXPORT EmbeddedWorkerInstance {
   int thread_id_;
   int worker_devtools_agent_route_id_;
 
+  // Whether devtools is attached or not.
+  bool devtools_attached_;
+
   StatusCallback start_callback_;
 
   ListenerList listener_list_;