Keep alive ServiceWorkers when devtools is attached

content/browser/devtools/embedded_worker_devtools_manager.cc

Index: content/browser/devtools/embedded_worker_devtools_manager.cc
diff --git a/content/browser/devtools/embedded_worker_devtools_manager.cc b/content/browser/devtools/embedded_worker_devtools_manager.cc
index 3726365973b865f06081c1519f678365b6f186b3..a3b8c5c8e2dc89b7ab512317db741dc02e1a6904 100644
--- a/content/browser/devtools/embedded_worker_devtools_manager.cc
+++ b/content/browser/devtools/embedded_worker_devtools_manager.cc
@@ -140,6 +140,13 @@ void EmbeddedWorkerDevToolsManager::WorkerDestroyed(int worker_process_id,
   DevToolsManager::GetInstance()->AgentHostChanged(agent_host);
 }
 
+void EmbeddedWorkerDevToolsManager::WorkerStopIgnored(int worker_process_id,
+                                                      int worker_route_id) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  // TODO(kinuko,pfeldman): Show a console message to tell the user that
+  // UA didn't terminate the worker because devtools is attached.
+}
+
 void EmbeddedWorkerDevToolsManager::WorkerReadyForInspection(
     int worker_process_id,
     int worker_route_id) {