Keep alive ServiceWorkers when devtools is attached

content/browser/devtools/embedded_worker_devtools_manager.h

Index: content/browser/devtools/embedded_worker_devtools_manager.h
diff --git a/content/browser/devtools/embedded_worker_devtools_manager.h b/content/browser/devtools/embedded_worker_devtools_manager.h
index 7103877be11864b242b144ff3bf5485db9b27dba..50b19b53aad78095684bfd3029ff5129ddd70781 100644
--- a/content/browser/devtools/embedded_worker_devtools_manager.h
+++ b/content/browser/devtools/embedded_worker_devtools_manager.h
@@ -82,6 +82,12 @@ class CONTENT_EXPORT EmbeddedWorkerDevToolsManager {
   bool debug_service_worker_on_start() const {
     return debug_service_worker_on_start_;
   }
+  void set_keep_alive_service_workers(bool keep_alive_mode) {
+    keep_alive_service_workers_ = keep_alive_mode;
+  }
+  bool keep_alive_service_workers() const {
+    return keep_alive_service_workers_;
+  }
 
  private:
   friend struct DefaultSingletonTraits<EmbeddedWorkerDevToolsManager>;
@@ -110,6 +116,7 @@ class CONTENT_EXPORT EmbeddedWorkerDevToolsManager {
   AgentHostMap workers_;
 
   bool debug_service_worker_on_start_;
+  bool keep_alive_service_workers_;
 
   DISALLOW_COPY_AND_ASSIGN(EmbeddedWorkerDevToolsManager);
 };