ServiceWorker: Implement navigator.serviceWorker.getRegistration [1/3]

public/platform/WebServiceWorkerProvider.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 37 matching lines @@
 class WebServiceWorkerProvider {
 public:
     // Called when a client wants to start listening to the service worker
     // events. Must be cleared before the client becomes invalid.
     virtual void setClient(WebServiceWorkerProviderClient*) { }
 
     // The WebServiceWorkerRegistration and WebServiceWorkerError ownership are
     // passed to the WebServiceWorkerRegistrationCallbacks implementation.
     typedef WebCallbacks<WebServiceWorkerRegistration, WebServiceWorkerError> WebServiceWorkerRegistrationCallbacks;
     typedef WebCallbacks<bool, WebServiceWorkerError> WebServiceWorkerUnregistrationCallbacks;
+    typedef WebCallbacks<WebServiceWorkerRegistration, WebServiceWorkerError> WebServiceWorkerGetRegistrationCallbacks;
 
     virtual void registerServiceWorker(const WebURL& pattern, const WebURL& scriptUrl, WebServiceWorkerRegistrationCallbacks*) { }
 
     // Unregisters the ServiceWorker for a given scope.
     virtual void unregisterServiceWorker(const WebURL& pattern, WebServiceWorkerUnregistrationCallbacks*) { }
 
+    virtual void getRegistration(const WebURL& documentURL, WebServiceWorkerGetRegistrationCallbacks*) { }
+
     virtual ~WebServiceWorkerProvider() { }
 };
 
 } // namespace blink
 
 #endif