Populate .current when navigator.serviceWorker is accessed

content/browser/service_worker/service_worker_handle.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/service_worker/service_worker_handle.h"
 
 #include "content/browser/service_worker/service_worker_context_core.h"
 #include "content/browser/service_worker/service_worker_registration.h"
 #include "content/common/service_worker/service_worker_messages.h"
 #include "ipc/ipc_sender.h"
@@ skipping 45 matching lines @@
 ServiceWorkerHandle::ServiceWorkerHandle(
     base::WeakPtr<ServiceWorkerContextCore> context,
     IPC::Sender* sender,
     int thread_id,
     ServiceWorkerRegistration* registration,
     ServiceWorkerVersion* version)
     : context_(context),
       sender_(sender),
       thread_id_(thread_id),
       handle_id_(context.get() ? context->GetNewServiceWorkerHandleId() : -1),
+      ref_count_(1),
       registration_(registration),
       version_(version) {
   version_->AddListener(this);
 }
 
 ServiceWorkerHandle::~ServiceWorkerHandle() {
   version_->RemoveListener(this);
   // TODO(kinuko): At this point we can discard the registration if
   // all documents/handles that have a reference to the registration is
   // closed or freed up, but could also keep it alive in cache
@@ skipping 29 matching lines @@
 
 ServiceWorkerObjectInfo ServiceWorkerHandle::GetObjectInfo() {
   ServiceWorkerObjectInfo info;
   info.handle_id = handle_id_;
   info.scope = registration_->pattern();
   info.url = registration_->script_url();
   info.state = GetWebServiceWorkerState(version_);
   return info;
 }
 
+void ServiceWorkerHandle::IncrementRefCount() {
+  DCHECK_GT(ref_count_, 0);
+  ++ref_count_;
+}
+
+void ServiceWorkerHandle::DecrementRefCount() {
+  DCHECK_GE(ref_count_, 0);
+  --ref_count_;
+}
+
 }  // namespace content