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

content/child/background_sync/background_sync_provider_thread_proxy.cc

 // 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.
 
 #include "content/child/background_sync/background_sync_provider_thread_proxy.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/lazy_instance.h"
 #include "base/location.h"
@@ skipping 83 matching lines @@
   BackgroundSyncProviderThreadProxy* instance =
       new BackgroundSyncProviderThreadProxy(main_thread_task_runner,
                                             sync_provider);
   WorkerTaskRunner::Instance()->AddStopObserver(instance);
   return instance;
 }
 
 void BackgroundSyncProviderThreadProxy::registerBackgroundSync(
     const blink::WebSyncRegistration* options,
     blink::WebServiceWorkerRegistration* service_worker_registration,
+    bool requested_from_service_worker,
     blink::WebSyncRegistrationCallbacks* callbacks) {
   DCHECK(options);
   DCHECK(service_worker_registration);
   DCHECK(callbacks);
   main_thread_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&BackgroundSyncProvider::registerBackgroundSync,
                  base::Unretained(sync_provider_), options,
-                 service_worker_registration,
+                 service_worker_registration, requested_from_service_worker,
                  new CallbackThreadAdapter<blink::WebSyncRegistrationCallbacks>(
                      make_scoped_ptr(callbacks),
                      WorkerTaskRunner::Instance()->CurrentWorkerId())));
 }
 
 void BackgroundSyncProviderThreadProxy::unregisterBackgroundSync(
     blink::WebSyncRegistration::Periodicity periodicity,
     int64_t id,
     const blink::WebString& tag,
     blink::WebServiceWorkerRegistration* service_worker_registration,
@@ skipping 76 matching lines @@
     : main_thread_task_runner_(main_thread_task_runner),
       sync_provider_(sync_provider) {
   g_sync_provider_tls.Pointer()->Set(this);
 }
 
 BackgroundSyncProviderThreadProxy::~BackgroundSyncProviderThreadProxy() {
   g_sync_provider_tls.Pointer()->Set(nullptr);
 }
 
 }  // namespace content