Introduce ServiceWorkerHandle for tracking WebServiceWorkerImpl reference

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_context_core.h"
+#include "content/browser/service_worker/service_worker_handle.h"
+#include "content/browser/service_worker/service_worker_registration.h"
+
+namespace content {
+
+scoped_ptr<ServiceWorkerHandle> ServiceWorkerHandle::Create(
+    base::WeakPtr<ServiceWorkerContextCore> context,
+    IPC::Sender* sender,
+    int thread_id,
+    ServiceWorkerVersion* version) {
+  if (!context || !version)
+    return scoped_ptr<ServiceWorkerHandle>();
+  ServiceWorkerRegistration* registration =
+      context->GetLiveRegistration(version->registration_id());
+  return make_scoped_ptr(
+      new ServiceWorkerHandle(context, sender, thread_id,
+                              registration, version));
+}
+
+ServiceWorkerHandle::ServiceWorkerHandle(
+    base::WeakPtr<ServiceWorkerContextCore> context,
+    IPC::Sender* sender,
+    int thread_id,
+    ServiceWorkerRegistration* registration,
+    ServiceWorkerVersion* version)
+    : context_(context),
+      sender_(sender),
+      thread_id_(thread_id),
+      registration_(registration),
+      version_(version) {
+}
+
+ServiceWorkerHandle::~ServiceWorkerHandle() {
+  // 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
+  // (e.g. in context_) for a while with some timer so that we don't
+  // need to re-load the same registration from disk over and over.
+}
+
+void ServiceWorkerHandle::OnVersionStateChanged(ServiceWorkerVersion* version) {
+  // TODO(kinuko): Implement.
+}
+
+}  // namespace content