Reland of [Background Sync] Allow sync manager access from uncontrolled clients

content/child/background_sync/background_sync_provider_thread_proxy.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_CHILD_BACKGROUND_SYNC_BACKGROUND_SYNC_PROVIDER_THREAD_PROXY_H_
 #define CONTENT_CHILD_BACKGROUND_SYNC_BACKGROUND_SYNC_PROVIDER_THREAD_PROXY_H_
 
 #include "base/macros.h"
 #include "content/child/worker_task_runner.h"
 #include "third_party/WebKit/public/platform/modules/background_sync/WebSyncProvider.h"
@@ skipping 17 matching lines @@
                                           public WorkerTaskRunner::Observer {
  public:
   static BackgroundSyncProviderThreadProxy* GetThreadInstance(
       base::SingleThreadTaskRunner* main_thread_task_runner,
       BackgroundSyncProvider* permissions_dispatcher);
 
   // blink::WebSyncProvider implementation
   void registerBackgroundSync(
       const blink::WebSyncRegistration* options,
       blink::WebServiceWorkerRegistration* service_worker_registration,
+      bool requested_from_service_worker,
       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,
@@ skipping 24 matching lines @@
   // and so should outlive the BackgroundSyncProviderThreadProxy, which is
   // created for a worker thread.
   BackgroundSyncProvider* sync_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundSyncProviderThreadProxy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_BACKGROUND_SYNC_BACKGROUND_SYNC_PROVIDER_THREAD_PROXY_H_