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

content/renderer/service_worker/service_worker_context_client.h

Index: content/renderer/service_worker/service_worker_context_client.h
diff --git a/content/renderer/service_worker/service_worker_context_client.h b/content/renderer/service_worker/service_worker_context_client.h
index 0b5b5d7d28588d6ebbc23b8c7aaf5ab7f52afb7e..bc24981b1db44cb633ee873335021f6ececfa785 100644
--- a/content/renderer/service_worker/service_worker_context_client.h
+++ b/content/renderer/service_worker/service_worker_context_client.h
@@ -15,6 +15,7 @@
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "content/child/webmessageportchannel_impl.h"
+#include "content/common/background_sync_service.mojom.h"
 #include "content/common/service_worker/service_worker_types.h"
 #include "ipc/ipc_listener.h"
 #include "third_party/WebKit/public/platform/WebGeofencingEventType.h"
@@ -50,6 +51,8 @@ class ServiceWorkerContextClient;
 class ThreadSafeSender;
 class WebServiceWorkerRegistrationImpl;
 
+using SyncCallback = mojo::Callback<void(ServiceWorkerEventStatus)>;
+
 // This class provides access to/from an ServiceWorker's WorkerGlobalScope.
 // Unless otherwise noted, all methods are called on the worker thread.
 class ServiceWorkerContextClient
@@ -144,6 +147,8 @@ class ServiceWorkerContextClient
   virtual void stashMessagePort(blink::WebMessagePortChannel* channel,
                                 const blink::WebString& name);
 
+  virtual void DispatchSyncEvent(const SyncCallback& callbacks);
+
  private:
   struct WorkerContextData;