Move content/child/background_sync to Blink.

content/child/background_sync/background_sync_provider.h

-// Copyright 2015 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_CHILD_BACKGROUND_SYNC_BACKGROUND_SYNC_PROVIDER_H_
-#define CONTENT_CHILD_BACKGROUND_SYNC_BACKGROUND_SYNC_PROVIDER_H_
-
-#include <stdint.h>
-
-#include <memory>
-#include <string>
-
-#include "base/macros.h"
-#include "content/public/child/worker_thread.h"
-#include "third_party/WebKit/public/platform/modules/background_sync/WebSyncProvider.h"
-#include "third_party/WebKit/public/platform/modules/background_sync/background_sync.mojom.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-}
-
-namespace content {
-
-// The BackgroundSyncProvider is called by the SyncManager and SyncRegistration
-// objects and communicates with the BackgroundSyncManager object in the browser
-// process. Each thread will have its own instance (e.g. main thread, worker
-// threads), instantiated as needed by BlinkPlatformImpl.  Each instance of
-// the provider creates a new mojo connection to a new
-// BackgroundSyncManagerImpl, which then talks to the BackgroundSyncManager
-// object.
-class BackgroundSyncProvider : public blink::WebSyncProvider,
-                               public WorkerThread::Observer {
- public:
-  // Constructor made public to allow BlinkPlatformImpl to own a copy for the
-  // main thread. Everyone else should use GetOrCreateThreadSpecificInstance().
-  explicit BackgroundSyncProvider(
-      const scoped_refptr<base::SingleThreadTaskRunner> main_task_runner);
-
-  ~BackgroundSyncProvider() override;
-
-  // Returns thread-specific instance (if exists).  Otherwise, a new instance
-  // will be created for the thread, except when called for a worker thread that
-  // has already been stopped.
-  static BackgroundSyncProvider* GetOrCreateThreadSpecificInstance(
-      base::SingleThreadTaskRunner* main_thread_task_runner);
-
-  // blink::WebSyncProvider implementation
-  void registerBackgroundSync(
-      const blink::WebSyncRegistration* options,
-      blink::WebServiceWorkerRegistration* service_worker_registration,
-      blink::WebSyncRegistrationCallbacks* callbacks) override;
-  void getRegistrations(
-      blink::WebServiceWorkerRegistration* service_worker_registration,
-      blink::WebSyncGetRegistrationsCallbacks* callbacks) override;
-
-  // WorkerThread::Observer implementation.
-  void WillStopCurrentWorkerThread() override;
-
- private:
-  // Callback handlers
-  void RegisterCallback(
-      std::unique_ptr<blink::WebSyncRegistrationCallbacks> callbacks,
-      blink::mojom::BackgroundSyncError error,
-      blink::mojom::SyncRegistrationPtr options);
-  void GetRegistrationsCallback(
-      std::unique_ptr<blink::WebSyncGetRegistrationsCallbacks> callbacks,
-      blink::mojom::BackgroundSyncError error,
-      mojo::Array<blink::mojom::SyncRegistrationPtr> registrations);
-
-  // Helper method that returns an initialized BackgroundSyncServicePtr.
-  blink::mojom::BackgroundSyncServicePtr& GetBackgroundSyncServicePtr();
-
-  blink::mojom::BackgroundSyncServicePtr background_sync_service_;
-  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
-
-  DISALLOW_COPY_AND_ASSIGN(BackgroundSyncProvider);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_BACKGROUND_SYNC_BACKGROUND_SYNC_PROVIDER_H_