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

content/browser/service_worker/service_worker_context_request_handler.cc

 // 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.
 
 #include "content/browser/service_worker/service_worker_context_request_handler.h"
 
 #include "base/time/time.h"
 #include "content/browser/service_worker/service_worker_context_core.h"
 #include "content/browser/service_worker/service_worker_provider_host.h"
 #include "content/browser/service_worker/service_worker_read_from_cache_job.h"
@@ skipping 193 matching lines @@
     return nullptr;
   }
 
   // Bypass the browser cache for initial installs and update checks after 24
   // hours have passed.
   int extra_load_flags = 0;
   base::TimeDelta time_since_last_check =
       base::Time::Now() - registration->last_update_check();
   if (time_since_last_check >
           base::TimeDelta::FromHours(kServiceWorkerScriptMaxCacheAgeInHours) ||
-      version_->force_bypass_cache_for_scripts()) {
+      version_->force_bypass_cache_for_scripts() || registration->use_cache()) {
     extra_load_flags = net::LOAD_BYPASS_CACHE;
   }
 
   ServiceWorkerVersion* stored_version = registration->waiting_version()
                                              ? registration->waiting_version()
                                              : registration->active_version();
   int64_t incumbent_resource_id = kInvalidServiceWorkerResourceId;
   if (is_main_script) {
     if (stored_version && stored_version->script_url() == request->url()) {
       incumbent_resource_id =
           stored_version->script_cache_map()->LookupResourceId(request->url());
     }
     version_->embedded_worker()->OnURLJobCreatedForMainScript();
   }
   *out_status = incumbent_resource_id == kInvalidServiceWorkerResourceId
                     ? CreateJobStatus::WRITE_JOB
                     : CreateJobStatus::WRITE_JOB_WITH_INCUMBENT;
   return new ServiceWorkerWriteToCacheJob(
       request, network_delegate, resource_type_, context_, version_.get(),
       extra_load_flags, resource_id, incumbent_resource_id);
 }
 
 }  // namespace content