Implement updateViaCache flag and no-cache by default for main service worker scripts

third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerRegistration.h

 // Copyright 2014 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 ServiceWorkerRegistration_h
 #define ServiceWorkerRegistration_h
 
 #include <memory>
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/ContextLifecycleObserver.h"
@@ skipping 52 matching lines @@
   static ServiceWorkerRegistration* GetOrCreate(
       ExecutionContext*,
       std::unique_ptr<WebServiceWorkerRegistration::Handle>);
 
   ServiceWorker* installing() { return installing_; }
   ServiceWorker* waiting() { return waiting_; }
   ServiceWorker* active() { return active_; }
   NavigationPreloadManager* navigationPreload();
 
   String scope() const;
+  String updateViaCache() const;
 
   WebServiceWorkerRegistration* WebRegistration() {
     return handle_->Registration();
   }
 
   ScriptPromise update(ScriptState*);
   ScriptPromise unregister(ScriptState*);
 
   DEFINE_ATTRIBUTE_EVENT_LISTENER(updatefound);
 
@@ skipping 36 matching lines @@
       registrations.push_back(
           ServiceWorkerRegistration::Take(resolver, std::move(registration)));
     }
     return registrations;
   }
 };
 
 }  // namespace blink
 
 #endif  // ServiceWorkerRegistration_h