Browser side of new ServiceWorker 'sync' event.

content/browser/service_worker/service_worker_version.h

Index: content/browser/service_worker/service_worker_version.h
diff --git a/content/browser/service_worker/service_worker_version.h b/content/browser/service_worker/service_worker_version.h
index d5463c49f2e1cc0f4109c7662e0fccdb4e6dbbe1..cc534abaf3210d41d9e425ebe67671f84ab560a5 100644
--- a/content/browser/service_worker/service_worker_version.h
+++ b/content/browser/service_worker/service_worker_version.h
@@ -150,6 +150,13 @@ class CONTENT_EXPORT ServiceWorkerVersion
   void DispatchFetchEvent(const ServiceWorkerFetchRequest& request,
                           const FetchCallback& callback);
 
+  // Sends sync event to the associated embedded worker and asynchronously calls
+  // |callback| when it errors out or it gets response from the worker to notify
+  // completion.
+  //
+  // This must be called when the status() is ACTIVE.
+  void DispatchSyncEvent(const StatusCallback& callback);
+
   // These are expected to be called when a renderer process host for the
   // same-origin as for this ServiceWorkerVersion is created.  The added
   // processes are used to run an in-renderer embedded worker.