Introduce worker_devtools_agent_route_id for EmbeddedWorker.

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 b57bc8fbbc54915e9ed13f1f0e6c2aa2565124b9..ae25cdbe0ba7e56e68701abd5015fa8c4947d0f0 100644
--- a/content/browser/service_worker/embedded_worker_instance.h
+++ b/content/browser/service_worker/embedded_worker_instance.h
@@ -88,6 +88,7 @@ class CONTENT_EXPORT EmbeddedWorkerInstance {
   Status status() const { return status_; }
   int process_id() const { return process_id_; }
   int thread_id() const { return thread_id_; }
+  int worker_route_id() const { return worker_route_id_; }
 
   void AddListener(Listener* listener);
   void RemoveListener(Listener* listener);
@@ -146,6 +147,7 @@ class CONTENT_EXPORT EmbeddedWorkerInstance {
   // Current running information. -1 indicates the worker is not running.
   int process_id_;
   int thread_id_;
+  int worker_route_id_;
 
   ProcessRefMap process_refs_;
   ListenerList listener_list_;