[Background Sync] Use Mojo IPC to fire background sync events

content/browser/service_worker/service_worker_event_dispatcher.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_BROWSER_SERVICE_WORKER_SERVICE_WORKER_EVENT_DISPATCHER_H_
+#define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_EVENT_DISPATCHER_H_
+
+#include "base/memory/ref_counted.h"
+#include "content/browser/service_worker/service_worker_version.h"
+#include "content/common/background_sync_service.mojom.h"
+#include "content/common/service_worker/service_worker_status_code.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace content {
+
+// This class is used by ServiceWorkerVersion to fire events in the service
+// worker using mojo IPC. It owns an InterfacePtr to each service, which it will
+// construct as necessary.
+//
+// All public methods must be called on UI thread. Can be constructed, owned,

[jkarlin, 2015/06/12 21:08:14]

s/Can be constructed/This class can be constructed/

+// and destructed on a separate thread.
+class ServiceWorkerEventDispatcher
+    : public base::RefCountedThreadSafe<ServiceWorkerEventDispatcher,
+                                        BrowserThread::DeleteOnUIThread> {
+ public:
+  ServiceWorkerEventDispatcher();
+
+  // Dispatches the event and then runs |callback| on |task_runner| with the
+  // result.
+  void DispatchSyncEvent(int render_process_id,
+                         int thread_id,
+                         const ServiceWorkerVersion::StatusCallback& callback,
+                         const scoped_refptr<base::TaskRunner>& task_runner);
+
+ private:
+  friend class base::RefCountedThreadSafe<ServiceWorkerEventDispatcher,
+                                          BrowserThread::DeleteOnUIThread>;
+  friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
+  friend class base::DeleteHelper<ServiceWorkerEventDispatcher>;
+
+  ~ServiceWorkerEventDispatcher();
+
+  void OnEventFinished(const ServiceWorkerVersion::StatusCallback& callback,
+                       const scoped_refptr<base::TaskRunner>& task_runner,
+                       ServiceWorkerEventStatus result);
+
+  BackgroundSyncServiceClientPtr background_sync_client_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_EVENT_DISPATCHER_H_