Keep alive ServiceWorkers when devtools is attached

content/browser/service_worker/service_worker_version.h

Index: content/browser/service_worker/service_worker_version.h
diff --git a/content/browser/service_worker/service_worker_version.h b/content/browser/service_worker/service_worker_version.h
index 7f6f74900370982846209114b62bd8df8375995f..37425a826dcb72b113ad7582d2f6f3454ee02523 100644
--- a/content/browser/service_worker/service_worker_version.h
+++ b/content/browser/service_worker/service_worker_version.h
@@ -248,11 +248,14 @@ class CONTENT_EXPORT ServiceWorkerVersion
   void Doom();
   bool is_doomed() const { return is_doomed_; }
 
+  void SetDevToolsAttached(bool attached);
+
  private:
   friend class base::RefCounted<ServiceWorkerVersion>;
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerControlleeRequestHandlerTest,
                            ActivateWaitingVersion);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerVersionTest, ScheduleStopWorker);
+  FRIEND_TEST_ALL_PREFIXES(ServiceWorkerVersionTest, KeepAlive);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerVersionTest, ListenerAvailability);
   typedef ServiceWorkerVersion self;
   typedef std::map<ServiceWorkerProviderHost*, int> ControlleeMap;
@@ -306,6 +309,9 @@ class CONTENT_EXPORT ServiceWorkerVersion
 
   void OnFocusClientFinished(int request_id, bool result);
   void ScheduleStopWorker();
+  void StopWorkerIfIdle();
+  bool HasInflightRequests() const;
+
   void DoomInternal();
 
   const int64 version_id_;
@@ -319,7 +325,8 @@ class CONTENT_EXPORT ServiceWorkerVersion
   std::vector<StatusCallback> stop_callbacks_;
   std::vector<base::Closure> status_change_callbacks_;
 
-  // Message callbacks.
+  // Message callbacks. (Update HasInflightRequests() too when you update this
+  // list.)
   IDMap<StatusCallback, IDMapOwnPointer> activate_callbacks_;
   IDMap<StatusCallback, IDMapOwnPointer> install_callbacks_;
   IDMap<FetchCallback, IDMapOwnPointer> fetch_callbacks_;