Remove InterfaceRegistry/Provider from service workers

content/common/service_worker/service_worker_event_dispatcher.mojom

 // Copyright 2016 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.
 
 module content.mojom;
 
 import "content/common/url_loader.mojom";
 import "mojo/common/common_custom_types.mojom";
+import "third_party/WebKit/public/platform/modules/background_sync/background_sync.mojom";
 import "third_party/WebKit/public/platform/modules/serviceworker/service_worker_event_status.mojom";
 
 [Native]
 struct ServiceWorkerFetchRequest;
 
 struct FetchEventPreloadHandle {
   URLLoader url_loader;
   URLLoaderClient& url_loader_client_request;
 };
 
-interface FetchEventDispatcher {
+// Renderer-side interface bound to ServiceWorkerContextClient for dispatching
+// events.
+interface ServiceWorkerEventDispatcher {
+  // |fetch_event_id| is used internally when sending the response back to the
+  // browser process.
   DispatchFetchEvent(int32 fetch_event_id, ServiceWorkerFetchRequest request,
                      FetchEventPreloadHandle? preload_handle)
       => (blink.mojom.ServiceWorkerEventStatus status,
           mojo.common.mojom.Time dispatch_event_time);
+  // Arguments are passed to the event handler as parameters of SyncEvent.
+  // Ref: https://wicg.github.io/BackgroundSync/spec/#sync-event
+  DispatchSyncEvent(string tag,
+                    blink.mojom.BackgroundSyncEventLastChance last_chance)
+      => (blink.mojom.ServiceWorkerEventStatus status,
+          mojo.common.mojom.Time dispatch_event_time);
 };