Implement a Mojo service for Background Fetch

content/browser/background_fetch/background_fetch_service_impl.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 CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_SERVICE_IMPL_H_
+#define CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_SERVICE_IMPL_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "third_party/WebKit/public/platform/modules/background_fetch/background_fetch.mojom.h"
+
+namespace content {
+
+class BackgroundFetchContext;
+class ServiceWorkerContextWrapper;
+
+// Implementation of the Mojo Background Fetch service. Will receive requests
+// and callers from Blink, which implements the Background Fetch JavaScript API.

[harkness, 2017/03/14 11:55:47]

nit: and calls? or just remove? Not sure what this is supposed to say. Also,
this could be called from other places besides Blink, do we want to say that or
only list Blink because that's the only current user?

[Peter Beverloo, 2017/03/14 15:17:21]

Fair enough. Realistically I'm not holding my breath for non-Blink users of this
API (there's likely a more appropriate API available to them), but Mojo does
enable this for sure.

+class BackgroundFetchServiceImpl : public blink::mojom::BackgroundFetchService {
+ public:
+  BackgroundFetchServiceImpl(
+      BackgroundFetchContext* background_fetch_context,
+      ServiceWorkerContextWrapper* service_worker_context);
+  ~BackgroundFetchServiceImpl() override;
+
+  static void Create(BackgroundFetchContext* background_fetch_context,
+                     ServiceWorkerContextWrapper* service_worker_context,
+                     blink::mojom::BackgroundFetchServiceRequest request);
+
+  // blink::mojom::BackgroundFetchService implementation.
+  void UpdateUI(int64_t service_worker_registration_id,
+                const std::string& tag,
+                const std::string& title,
+                const UpdateUICallback& callback) override;
+  void Abort(int64_t service_worker_registration_id,
+             const std::string& tag) override;
+  void GetRegistration(int64_t service_worker_registration_id,
+                       const std::string& tag,
+                       const GetRegistrationCallback& callback) override;
+  void GetTags(int64_t service_worker_registration_id,
+               const GetTagsCallback& callback) override;
+
+ private:
+  scoped_refptr<BackgroundFetchContext> background_fetch_context_;
+  scoped_refptr<ServiceWorkerContextWrapper> service_worker_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(BackgroundFetchServiceImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_SERVICE_IMPL_H_