[Background Sync] Add renderer code to interface between JS API and back-end service

content/child/background_sync/background_sync_provider.h

Index: content/child/background_sync/background_sync_provider.h
diff --git a/content/child/background_sync/background_sync_provider.h b/content/child/background_sync/background_sync_provider.h
new file mode 100644
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+++ b/content/child/background_sync/background_sync_provider.h
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+// 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 <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "content/child/worker_task_runner.h"
+#include "content/common/background_sync_service.mojom.h"
+#include "third_party/WebKit/public/platform/modules/background_sync/WebSyncProvider.h"
+
+namespace content {
+
+class ServiceRegistry;
+
+// The BackgroundSyncProvider is called by the SyncManager and SyncRegistration
+// objects (and their Periodic counterparts) and communicates with the
+// BackgroundSyncManager object in the browser process. This class is
+// instantiated on the main thread by BlinkPlatformImpl, and its methods can be
+// called directly from the main thread.
+class BackgroundSyncProvider : public blink::WebSyncProvider {
+ public:
+  explicit BackgroundSyncProvider(ServiceRegistry* service_registry);
+
+  ~BackgroundSyncProvider() override;
+
+  // blink::WebSyncProvider implementation
+  void registerBackgroundSync(
+      const blink::WebSyncRegistration* options,
+      blink::WebServiceWorkerRegistration* service_worker_registration,
+      blink::WebSyncRegistrationCallbacks* callbacks);
+  void unregisterBackgroundSync(
+      blink::WebSyncRegistration::Periodicity periodicity,
+      int64_t id,
+      const blink::WebString& tag,
+      blink::WebServiceWorkerRegistration* service_worker_registration,
+      blink::WebSyncUnregistrationCallbacks* callbacks);
+  void getRegistration(
+      blink::WebSyncRegistration::Periodicity,
+      const blink::WebString& tag,
+      blink::WebServiceWorkerRegistration* service_worker_registration,
+      blink::WebSyncRegistrationCallbacks* callbacks);
+  void getRegistrations(
+      blink::WebSyncRegistration::Periodicity periodicity,
+      blink::WebServiceWorkerRegistration* service_worker_registration,
+      blink::WebSyncGetRegistrationsCallbacks* callbacks);
+
+ private:
+  // Callback handlers
+  void RegisterCallback(
+      scoped_ptr<blink::WebSyncRegistrationCallbacks> callbacks,
+      const SyncRegistrationPtr& options);
+  void UnregisterCallback(
+      scoped_ptr<blink::WebSyncUnregistrationCallbacks> callbacks,
+      bool success);
+  void GetRegistrationsCallback(
+      scoped_ptr<blink::WebSyncGetRegistrationsCallbacks> callbacks,
+      const mojo::Array<SyncRegistrationPtr>& registrations);
+
+  // Helper method that returns an initialized BackgroundSyncServicePtr.
+  BackgroundSyncServicePtr& GetBackgroundSyncServicePtr();
+
+  ServiceRegistry* service_registry_;
+  BackgroundSyncServicePtr background_sync_service_;
+
+  DISALLOW_COPY_AND_ASSIGN(BackgroundSyncProvider);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_CHILD_BACKGROUND_SYNC_BACKGROUND_SYNC_PROVIDER_H_