ServiceWorker: add ServiceWorkerClients.claim() support (2/3).

content/browser/service_worker/service_worker_registration.h

 // Copyright 2013 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_BROWSER_SERVICE_WORKER_SERVICE_WORKER_REGISTRATION_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_REGISTRATION_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 91 matching lines @@
   // registation, the method will reset that field to NULL, and notify
   // listeners via OnVersionAttributesChanged.
   void UnsetVersion(ServiceWorkerVersion* version);
 
   // Triggers the [[Activate]] algorithm when the currently active version
   // has no controllees. If there are no controllees at the time the method
   // is called or when version's skip waiting flag is set, activation is
   // initiated immediately.
   void ActivateWaitingVersionWhenReady();
 
+  // Takes over control of provider hosts which are currently not controlled or
+  // controlled by other registrations.
+  void ClaimClients();
+
   // Triggers the [[ClearRegistration]] algorithm when the currently
   // active version has no controllees. Deletes this registration
   // from storage immediately.
   void ClearWhenReady();
 
   // Restores this registration in storage and cancels the pending
   // [[ClearRegistration]] algorithm.
   void AbortPendingClear(const StatusCallback& callback);
 
   // The time of the most recent update check.
@@ skipping 54 matching lines @@
   scoped_refptr<ServiceWorkerVersion> installing_version_;
   ObserverList<Listener> listeners_;
   base::WeakPtr<ServiceWorkerContextCore> context_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerRegistration);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_REGISTRATION_H_