Introduce the Background Fetch module.

third_party/WebKit/Source/modules/background_fetch/ServiceWorkerRegistrationBackgroundFetch.h

+// Copyright 2017 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.
+
+#ifndef ServiceWorkerRegistrationBackgroundFetch_h
+#define ServiceWorkerRegistrationBackgroundFetch_h
+
+#include "modules/serviceworkers/ServiceWorkerRegistration.h"
+#include "platform/Supplementable.h"
+#include "platform/heap/GarbageCollected.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class BackgroundFetchManager;
+
+class ServiceWorkerRegistrationBackgroundFetch final
+    : public GarbageCollectedFinalized<
+          ServiceWorkerRegistrationBackgroundFetch>,
+      public Supplement<ServiceWorkerRegistration> {
+  USING_GARBAGE_COLLECTED_MIXIN(ServiceWorkerRegistrationBackgroundFetch);
+  WTF_MAKE_NONCOPYABLE(ServiceWorkerRegistrationBackgroundFetch);
+
+ public:
+  virtual ~ServiceWorkerRegistrationBackgroundFetch();
+
+  static ServiceWorkerRegistrationBackgroundFetch& from(
+      ServiceWorkerRegistration&);
+
+  static BackgroundFetchManager* backgroundFetch(ServiceWorkerRegistration&);
+  BackgroundFetchManager* backgroundFetch();
+
+  DECLARE_VIRTUAL_TRACE();
+
+ private:
+  explicit ServiceWorkerRegistrationBackgroundFetch(ServiceWorkerRegistration*);
+  static const char* supplementName();
+
+  Member<ServiceWorkerRegistration> m_registration;
+  Member<BackgroundFetchManager> m_backgroundFetchManager;
+};
+
+}  // namespace blink
+
+#endif  // ServiceWorkerRegistrationBackgroundFetch_h