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

content/child/service_worker/service_worker_registration_handle_reference.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 CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_REGISTRATION_HANDLE_REFERENCE_H_
 #define CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_REGISTRATION_HANDLE_REFERENCE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 23 matching lines @@
   // ref-count.
   static std::unique_ptr<ServiceWorkerRegistrationHandleReference> Adopt(
       const ServiceWorkerRegistrationObjectInfo& info,
       ThreadSafeSender* sender);
 
   ~ServiceWorkerRegistrationHandleReference();
 
   const ServiceWorkerRegistrationObjectInfo& info() const { return info_; }
   int handle_id() const { return info_.handle_id; }
   GURL scope() const { return info_.options.scope; }
+  blink::WebServiceWorkerUpdateViaCache update_via_cache() const {
+    return info_.options.update_via_cache;
+  }
   int64_t registration_id() const { return info_.registration_id; }
 
  private:
   ServiceWorkerRegistrationHandleReference(
       const ServiceWorkerRegistrationObjectInfo& info,
       ThreadSafeSender* sender,
       bool increment_ref_in_ctor);
 
   ServiceWorkerRegistrationObjectInfo info_;
   scoped_refptr<ThreadSafeSender> sender_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerRegistrationHandleReference);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_REGISTRATION_HANDLE_REFERENCE_H_