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..7bc5e6f40a942de299c7162cd61320c325293034 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"
@@ -51,21 +52,28 @@ ServiceWorkerDispatcherHost::~ServiceWorkerDispatcherHost() {
     context_->RemoveAllProviderHostsForProcess(render_process_id_);
     context_->embedded_worker_registry()->RemoveChildProcessSender(
         render_process_id_);
+    context_->embedded_worker_registry()
+        ->RemoveChildProcessNextRoutingIDCallback(render_process_id_);
   }
 }
 
 void ServiceWorkerDispatcherHost::Init(
-    ServiceWorkerContextWrapper* context_wrapper) {
+    ServiceWorkerContextWrapper* context_wrapper,
+    const base::Callback<int(void)>& next_routing_id_callback) {
   if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
-    BrowserThread::PostTask(
-        BrowserThread::IO, FROM_HERE,
-        base::Bind(&ServiceWorkerDispatcherHost::Init,
-                    this, make_scoped_refptr(context_wrapper)));
+    BrowserThread::PostTask(BrowserThread::IO,
+                            FROM_HERE,
+                            base::Bind(&ServiceWorkerDispatcherHost::Init,
+                                       this,
+                                       make_scoped_refptr(context_wrapper),
+                                       next_routing_id_callback));
       return;
   }
   context_ = context_wrapper->context()->AsWeakPtr();
   context_->embedded_worker_registry()->AddChildProcessSender(
       render_process_id_, this);
+  context_->embedded_worker_registry()->AddChildProcessNextRoutingIDCallback(
+      render_process_id_, next_routing_id_callback);
 }
 
 void ServiceWorkerDispatcherHost::OnDestruct() const {