Keep alive ServiceWorkers when devtools is attached

content/browser/service_worker/service_worker_context_core.h

Index: content/browser/service_worker/service_worker_context_core.h
diff --git a/content/browser/service_worker/service_worker_context_core.h b/content/browser/service_worker/service_worker_context_core.h
index 63522ea3b39ac1b8d1cf152bc06a5eaf01faff71..b0cd566b1d1a3c3dd8a9fcc685d642fa9101e983 100644
--- a/content/browser/service_worker/service_worker_context_core.h
+++ b/content/browser/service_worker/service_worker_context_core.h
@@ -187,6 +187,12 @@ class CONTENT_EXPORT ServiceWorkerContextCore
       net::URLRequestContext* request_context,
       base::WeakPtr<storage::BlobStorageContext> blob_storage_context);
 
+  // If |keep_alive_mode| is set to true, all existing and new service workers
+  // won't get stopped unless they are manually stopped or the process running
+  // the service worker is killed.
+  void SetKeepAliveMode(bool keep_alive_mode);
+  bool keep_alive_mode() const { return keep_alive_mode_; }
+
   base::WeakPtr<ServiceWorkerContextCore> AsWeakPtr() {
     return weak_factory_.GetWeakPtr();
   }
@@ -229,6 +235,7 @@ class CONTENT_EXPORT ServiceWorkerContextCore
   int next_registration_handle_id_;
   scoped_refptr<ObserverListThreadSafe<ServiceWorkerContextObserver> >
       observer_list_;
+  bool keep_alive_mode_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerContextCore);
 };