Introduce worker_devtools_agent_route_id for EmbeddedWorker.

content/browser/service_worker/service_worker_dispatcher_host.cc

Index: content/browser/service_worker/service_worker_dispatcher_host.cc
diff --git a/content/browser/service_worker/service_worker_dispatcher_host.cc b/content/browser/service_worker/service_worker_dispatcher_host.cc
index 562fc9571cafa89b4f368e976f77d64af40dc6fe..16c52fa41a6adf85ab387cfd8f4c9b89c4b4db14 100644
--- a/content/browser/service_worker/service_worker_dispatcher_host.cc
+++ b/content/browser/service_worker/service_worker_dispatcher_host.cc
@@ -4,6 +4,7 @@
 
 #include "content/browser/service_worker/service_worker_dispatcher_host.h"
 
+#include "base/bind.h"
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/message_port_message_filter.h"
@@ -51,6 +52,8 @@ ServiceWorkerDispatcherHost::~ServiceWorkerDispatcherHost() {
     context_->RemoveAllProviderHostsForProcess(render_process_id_);
     context_->embedded_worker_registry()->RemoveChildProcessSender(
         render_process_id_);
+    context_->embedded_worker_registry()
+        ->RemoveChildProcessNextRoutingIDCallback(render_process_id_);
   }
 }
 
@@ -66,6 +69,10 @@ void ServiceWorkerDispatcherHost::Init(
   context_ = context_wrapper->context()->AsWeakPtr();
   context_->embedded_worker_registry()->AddChildProcessSender(
       render_process_id_, this);
+  context_->embedded_worker_registry()->AddChildProcessNextRoutingIDCallback(
+      render_process_id_,
+      base::Bind(&MessagePortMessageFilter::GetNextRoutingID,
+                 message_port_message_filter_));
 }
 
 void ServiceWorkerDispatcherHost::OnDestruct() const {